Pyrimidines

The nomenclature of pyrimidines is straightforward. However, like other heterocyclics, tautomeric hydroxyl groups yield complications since they exist primarily in the cyclic amide form. 1722-12-9, formula is C4H3ClN2, Name is 2-Chloropyrimidine. For example, 2-hydroxypyrimidine is more properly named 2-pyrimidone. A partial list of trivial names of various pyrimidines exists. Electric Literature of 1722-12-9.

Uludag, Nesimi;Serdaroglu, Goncagul research published 《 An efficient studies on C-2 cyanomethylation of the indole synthesis: The electronic and spectroscopic characterization (FT-IR, NMR, UV-Vis), antioxidant activity, and theoretical calculations》, the research content is summarized as follows. The direct cynamethylation with the development of catalyzed methodologies directed to 2-(cyanomethyl)indoles was reported by using tetrafluoro-1,4-benzoquinone (TFB) as the catalyst and it was synthesized in one step without protecting the indole N-H. Due to the plenty of synthesis indole moieties is currently the object of extensive investigations due to their biol. interesting role as the recognized block in many natural products and bioactive products. The antioxidant activity of the intermediates and the final product was explored by the DPPH method, and the results disclosed that the intermediate 2-((1-pyrimidin-2-yl)-1H-indol-2-yl)acetonitrile and the final product could be used as promising agents in biomedicinal research. The structural and physicochem. properties of the intermediate and product indoles were enlightened by DFT calculations at B3LYP/6-311G(d,p) level, in the gas, CHCl3, methanol, and water environments. The TD-DFT calculations at the same level of theory were performed to compare with the recorded spectra of the studied compounds and to illuminate the possible electronic transitions (s0→ sn) underlying the observed peaks. The NBO analyses of the compounds indicated that the n→ π* and π→ π* interactions were a great portion of the lowering of the stabilization energy. The FMO analyses displayed that the intermediates and product, but the intermediate R2a mostly in all solvents, tended the electrodonating capability to the external mol. system.

1722-12-9, 2-Chloropyrimidine is a monochlorinated pyrimidine with plant growth regulating activity. Chloropyrimidine is a useful reagent in the preparation of antivirals and other biologically active compounds.
2-Chloropyrimidine undergoes cobalt-catalyzed cross-coupling reaction with aryl halides.
2-Chloropyrimidine is a molecule that can be synthesized by the oxidation of pyrimidine with hydrogen peroxide and hydrochloric acid. The reaction proceeds through an electrochemical process in which the oxidation catalyst is a platinum electrode. This reaction is catalyzed by the nucleophilic attack of malonic acid on the chloropyrimidine at the methylene group. This efficient method for making 2-chloropyrimidine has been applied to synthesize aryl halides, including phenyl chloropyrimidine and pyridyl chloropyrimidine, from their corresponding chloride and bromide precursors. The fluorescence properties of 2-chloropyrimidine have been studied in coordination chemistry, where it forms complexes with metal ions such as Mn2+. In this study, it was found that adsorption mechanisms are dependent on molecular size, charge density, kinetic energy, and adsorbent surface area., Electric Literature of 1722-12-9

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, 1722-12-9, formula is C4H3ClN2, Name is 2-Chloropyrimidine. including the nucleotides cytosine, thymine and uracil, thiamine (vitamin B1) and alloxan. Application of C4H3ClN2.

Tyler, Jasper L.;Noble, Adam;Aggarwal, Varinder K. research published 《 Strain-Release-Driven Friedel-Crafts Spirocyclization of Azabicyclo[1.1.0]butanes》, the research content is summarized as follows. The strain-release-driven Friedel-Crafts spirocyclization of azabicyclo[1.1.0]butane-tethered (hetero)aryls I (R = H, Me, Bn, allyl, triethylsilyl; R¹ = Ph, 2-naphthyl, benzothiophen-2-yl, etc.) for the synthesis of a unique library of azetidine spiro-tetralins e.g., II was reported. The reaction was discovered to proceed through an unexpected interrupted Friedel-Crafts mechanism, generating a highly complex azabicyclo[2.1.1]hexane scaffold. This dearomatized intermediate, formed exclusively as a single diastereomer, can be subsequently converted to the Friedel-Crafts product upon electrophilic activation of the tertiary amine, or trapped as a Diels-Alder adduct in one-pot. The rapid assembly of mol. complexity demonstrated in these reactions highlights the potential of the strain-release-driven spirocyclization strategy to be utilized in the synthesis of medicinally relevant scaffolds.

Application of C4H3ClN2, 2-Chloropyrimidine is a monochlorinated pyrimidine with plant growth regulating activity. Chloropyrimidine is a useful reagent in the preparation of antivirals and other biologically active compounds.
2-Chloropyrimidine undergoes cobalt-catalyzed cross-coupling reaction with aryl halides.
2-Chloropyrimidine is a molecule that can be synthesized by the oxidation of pyrimidine with hydrogen peroxide and hydrochloric acid. The reaction proceeds through an electrochemical process in which the oxidation catalyst is a platinum electrode. This reaction is catalyzed by the nucleophilic attack of malonic acid on the chloropyrimidine at the methylene group. This efficient method for making 2-chloropyrimidine has been applied to synthesize aryl halides, including phenyl chloropyrimidine and pyridyl chloropyrimidine, from their corresponding chloride and bromide precursors. The fluorescence properties of 2-chloropyrimidine have been studied in coordination chemistry, where it forms complexes with metal ions such as Mn2+. In this study, it was found that adsorption mechanisms are dependent on molecular size, charge density, kinetic energy, and adsorbent surface area., 1722-12-9.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, 1722-12-9, formula is C4H3ClN2, Name is 2-Chloropyrimidine. including the nucleotides cytosine, thymine and uracil, thiamine (vitamin B1) and alloxan. Application In Synthesis of 1722-12-9.

Tu, Deshuang;Zhang, Jianyu;Zhang, Yunxiao;Sung, Herman H. Y.;Liu, Lijie;Kwok, Ryan T. K.;Lam, Jacky W. Y.;Williams, Ian D.;Yan, Hong;Tang, Ben Zhong research published 《 How Do Molecular Motions Affect Structures and Properties at Molecule and Aggregate Levels?》, the research content is summarized as follows. Mol. motions are essential natures of matter and play important roles in their structures and properties. However, owing to the diversity and complexity of structures and behaviors, the study of motion-structure-property relationships remains a challenge, especially at all levels of structural hierarchy from mols. to macro-objects. Herein, luminogens showing aggregation-induced emission (AIE), namely, 9-(pyrimidin-2-yl)-carbazole (PyCz) and 9-(5-R-pyrimidin-2-yl)-carbazole [R = Cl (ClPyCz), Br (BrPyCz), and CN (CyPyCz)], were designed and synthesized, to decipher the dependence of materials’ structures and properties on mol. motions at the mol. and aggregate levels. Exptl. and theor. anal. demonstrated that the active intramol. motions in the excited state of all mols. at the single-mol. level endowed them with more twisted structural conformations and weak emission. However, owing to the restriction of intramol. motions in the nano/macroaggregate state, all the mols. assumed less twisted conformations with bright emission. Unexpectedly, intermol. motions could be activated in the macrocrystals of ClPyCz, BrPyCz, and CyPyCz through the introduction of external perturbations, and synergic strong and weak intermol. interactions allowed their crystals to undergo reversible deformation, which effectively solved the problem of the brittleness of organic crystals, while endowing them with excellent elastic performance. Thus, the present study provided insights on the motion-structure-property relationship at each level of structural hierarchy and offered a paradigm to rationally design multifunctional AIE-based materials.

Application In Synthesis of 1722-12-9, 2-Chloropyrimidine is a monochlorinated pyrimidine with plant growth regulating activity. Chloropyrimidine is a useful reagent in the preparation of antivirals and other biologically active compounds.
2-Chloropyrimidine undergoes cobalt-catalyzed cross-coupling reaction with aryl halides.
2-Chloropyrimidine is a molecule that can be synthesized by the oxidation of pyrimidine with hydrogen peroxide and hydrochloric acid. The reaction proceeds through an electrochemical process in which the oxidation catalyst is a platinum electrode. This reaction is catalyzed by the nucleophilic attack of malonic acid on the chloropyrimidine at the methylene group. This efficient method for making 2-chloropyrimidine has been applied to synthesize aryl halides, including phenyl chloropyrimidine and pyridyl chloropyrimidine, from their corresponding chloride and bromide precursors. The fluorescence properties of 2-chloropyrimidine have been studied in coordination chemistry, where it forms complexes with metal ions such as Mn2+. In this study, it was found that adsorption mechanisms are dependent on molecular size, charge density, kinetic energy, and adsorbent surface area., 1722-12-9.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, 4595-59-9, formula is C4H3BrN2, Name is 5-Bromopyrimidine. including the nucleotides cytosine, thymine and uracil, thiamine (vitamin B1) and alloxan. Application of C4H3BrN2.

Trowse, Benjamin R.;Byrne, Fergal P.;Sherwood, James;O’Brien, Peter;Murray, Jane;Farmer, Thomas J. research published 《 Study on 2,2,5,5-Tetramethyloxolane (TMO) as a Solvent for Buchwald-Hartwig Aminations》, the research content is summarized as follows. Herein, the successful application of 2,2,5,5-tetramethyloxolane (TMO), a solvent with a similar property profile to toluene, for Buchwald-Hartwig amination reactions for coupling a wide range of primary and secondary amines with aryl bromides was demonstrated. When NaOt-Bu was used as the base, similar yields were obtained in toluene and TMO. In contrast, using Cs₂CO₃, TMO outperformed toluene significantly for electron-deficient aryl bromides that could be susceptible to nucleophilic attack. To showcase the use of TMO as a solvent for Buchwald-Hartwig aminations, the synthesis of a key intermediate in the route to smoothened (SMO) receptor antagonist drug candidate SEN826 was successfully accomplished in TMO. Improved metrics and reduction in residual palladium in the isolated amines demonstrate further benefits in the substitution of toluene with TMO in Buchwald-Hartwig aminations.

Application of C4H3BrN2, 5-Bromopyrimidine is a reactive intermediate that is used in the synthesis of 4-methoxyphenylboronic acid. 5-Bromopyrimidine has been shown to be nucleophilic, reacting with β-amino acids under basic conditions to form the corresponding 2-bromo amide. It also undergoes cross-coupling reactions with halides and can be used as a building block for other organic compounds. 5-Bromopyrimidine has optical properties that are characteristic of aromatic molecules, including strong absorption bands in the ultraviolet region and visible light region.
5-Bromopyrimidine undergoes direct metallation with lithuium diisopropylamide to yield 4-lithio-5-bromopyrimidine., 4595-59-9.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The systematic study of pyrimidines began in 1884 with Pinner, who synthesized derivatives by condensing ethyl acetoacetate with amidines. Pinner first proposed the name “pyrimidin” in 1885. 109-12-6, formula is C4H5N3, Name is Pyrimidin-2-amine. The parent compound was first prepared by Gabriel and Colman in 1900, by conversion of barbituric acid to 2,4,6-trichloropyrimidine followed by reduction using zinc dust in hot water. Computed Properties of 109-12-6.

Trowse, Benjamin R.;Byrne, Fergal P.;Sherwood, James;O’Brien, Peter;Murray, Jane;Farmer, Thomas J. research published 《 Study on 2,2,5,5-Tetramethyloxolane (TMO) as a Solvent for Buchwald-Hartwig Aminations》, the research content is summarized as follows. Herein, the successful application of 2,2,5,5-tetramethyloxolane (TMO), a solvent with a similar property profile to toluene, for Buchwald-Hartwig amination reactions for coupling a wide range of primary and secondary amines with aryl bromides was demonstrated. When NaOt-Bu was used as the base, similar yields were obtained in toluene and TMO. In contrast, using Cs₂CO₃, TMO outperformed toluene significantly for electron-deficient aryl bromides that could be susceptible to nucleophilic attack. To showcase the use of TMO as a solvent for Buchwald-Hartwig aminations, the synthesis of a key intermediate in the route to smoothened (SMO) receptor antagonist drug candidate SEN826 was successfully accomplished in TMO. Improved metrics and reduction in residual palladium in the isolated amines demonstrate further benefits in the substitution of toluene with TMO in Buchwald-Hartwig aminations.

Computed Properties of 109-12-6, 2-Aminopyrimidine is a useful research compound. Its molecular formula is C4H5N3 and its molecular weight is 95.1 g/mol. The purity is usually 95%.
2-Aminopyrimidine is an organic compound that belongs to the group of pyridines. It has been shown to have antimicrobial, antitumor, and antiviral properties. 2-Aminopyrimidine has been used as a fungicide and herbicide in horticulture and agriculture, respectively. The molecular geometry of this molecule is octahedral with coordination geometry C2v. This chemical binds to the BCR-ABL kinase receptor and inhibits its activity by competitive inhibition of ATP binding. 2-Aminopyrimidine has been shown to have a hematologic response in vivo models and in vitro assays. It also has anti-inflammatory effects when it is taken orally or applied topically., 109-12-6.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. 4595-59-9, formula is C4H3BrN2, Name is 5-Bromopyrimidine. In nucleic acids, three types of nucleobases are pyrimidine derivatives: cytosine (C), thymine (T), and uracil (U). SDS of cas: 4595-59-9.

Trapp, Oliver;Lamour, Saskia;Maier, Frank;Siegle, Alexander F.;Zawatzky, Kerstin;Straub, Bernd F. research published 《 In Situ Mass Spectrometric and Kinetic Investigations of Soai’s Asymmetric Autocatalysis》, the research content is summarized as follows. Chem. reactions that lead to a spontaneous symmetry breaking or amplification of the enantiomeric excess are of fundamental interest in explaining the formation of a homochiral world. An outstanding example is Soai’s asym. autocatalysis, in which small enantiomeric excesses of the added product alc. are amplified in the reaction of diisopropylzinc and pyrimidine-5-carbaldehydes. The exact mechanism is still in dispute due to complex reaction equilibrium and elusive intermediates. In situ high-resolution mass spectrometric measurements, detailed kinetic analyses and doping with in situ reacting reaction mixtures show the transient formation of hemiacetal complexes, which can establish an autocatalytic cycle. We propose a mechanism that explains the autocatalytic amplification involving these hemiacetal complexes. Comprehensive kinetic experiments and modeling of the hemiacetal formation and the Soai reaction allow the precise prediction of the reaction progress, the enantiomeric excess as well as the enantiomeric excess dependent time shift in the induction period. Exptl. structural data give insights into the privileged properties of the pyrimidyl units and the formation of diastereomeric structures leading to an efficient amplification of even minimal enantiomeric excesses, resp.

SDS of cas: 4595-59-9, 5-Bromopyrimidine is a reactive intermediate that is used in the synthesis of 4-methoxyphenylboronic acid. 5-Bromopyrimidine has been shown to be nucleophilic, reacting with β-amino acids under basic conditions to form the corresponding 2-bromo amide. It also undergoes cross-coupling reactions with halides and can be used as a building block for other organic compounds. 5-Bromopyrimidine has optical properties that are characteristic of aromatic molecules, including strong absorption bands in the ultraviolet region and visible light region.
5-Bromopyrimidine undergoes direct metallation with lithuium diisopropylamide to yield 4-lithio-5-bromopyrimidine., 4595-59-9.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Pyrimidine is a nitrogenous base similar to benzene (a six-membered ring) and includes cytosine, thymine, and uracil as bases used for DNA or RNA. 4595-59-9, formula is C4H3BrN2, Name is 5-Bromopyrimidine. Pyrimidine also found in many synthetic compounds such as barbiturates and the HIV drug, zidovudine. Electric Literature of 4595-59-9.

Tran, Van T.;Li, Zi-Qi;Apolinar, Omar;Derosa, Joseph;Joannou, Matthew V.;Wisniewski, Steven R.;Eastgate, Martin D.;Engle, Keary M. research published 《 Ni(COD)(DQ): An Air-Stable 18-Electron Nickel(0)-Olefin Precatalyst》, the research content is summarized as follows. We report that Ni(COD)(DQ) (COD = 1,5-cyclooctadiene, DQ = duroquinone), an air-stable 18-electron complex originally described by Schrauzer in 1962, is a competent precatalyst for a variety of nickel-catalyzed synthetic methods from the literature. Due to its apparent stability, use of Ni(COD)(DQ) as a precatalyst allows reactions to be conveniently performed without use of an inert-atm. glovebox, as demonstrated across several case studies.

Electric Literature of 4595-59-9, 5-Bromopyrimidine is a reactive intermediate that is used in the synthesis of 4-methoxyphenylboronic acid. 5-Bromopyrimidine has been shown to be nucleophilic, reacting with β-amino acids under basic conditions to form the corresponding 2-bromo amide. It also undergoes cross-coupling reactions with halides and can be used as a building block for other organic compounds. 5-Bromopyrimidine has optical properties that are characteristic of aromatic molecules, including strong absorption bands in the ultraviolet region and visible light region.
5-Bromopyrimidine undergoes direct metallation with lithuium diisopropylamide to yield 4-lithio-5-bromopyrimidine., 4595-59-9.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, including the nucleotides cytosine, thymine and uracil, thiamine (vitamin B1) and alloxan. 4595-59-9, formula is C4H3BrN2, Name is 5-Bromopyrimidine. It is also found in many synthetic compounds such as barbiturates and the HIV drug, zidovudine. Application In Synthesis of 4595-59-9.

Tran, Ryan Q.;Dinh, Long P.;Jacoby, Seth A.;Harris, Nekoda W.;Swann, William A.;Williamson, Savannah N.;Semsey, Rebecca Y.;Yet, Larry research published 《 Synthesis of 3-aryl-1-phosphinoimidazo[1,5-a]pyridine ligands for use in Suzuki-Miyaura cross-coupling reactions》, the research content is summarized as follows. 3-Aryl-1-phosphinoimidazo[1,5-a]pyridine ligands I [R = Cy, Ph; Ar = Ph, 2-MeOC₆H₄, 2,6-(OMe)₂C₆H₃, etc.] were synthesized from 2-aminomethylpyridine as the initial substrate via two complementary routes. The first synthetic pathway underwent the coupling of 2-aminomethylpyridine with substituted benzoyl chlorides, followed by cyclization, iodination and palladium-catalyzed cross-coupling phosphination reactions sequence to give phosphorus ligands I. In the second route, 2-aminomethylpyridine was cyclized with aryl aldehydes, followed by the iodination and palladium-catalyzed cross-coupling phosphination reactions to yield phosphorus ligands I. Ligands I were evaluated in synthesis of sterically-hindered biaryls and heterobiaryls R¹-R² [R = 2-H₂N₆H₄, 4-NC₆H₄, 3-pyridyl, etc.; R¹ = 2-MeO₆H₄, 3-thienyl, 3-pyridyl, etc.] via palladium-catalyzed Suzuki-Miyaura cross-coupling reaction of hetero(aryl) halides with hetero(aryl)boronic acids.

4595-59-9, 5-Bromopyrimidine is a reactive intermediate that is used in the synthesis of 4-methoxyphenylboronic acid. 5-Bromopyrimidine has been shown to be nucleophilic, reacting with β-amino acids under basic conditions to form the corresponding 2-bromo amide. It also undergoes cross-coupling reactions with halides and can be used as a building block for other organic compounds. 5-Bromopyrimidine has optical properties that are characteristic of aromatic molecules, including strong absorption bands in the ultraviolet region and visible light region.
5-Bromopyrimidine undergoes direct metallation with lithuium diisopropylamide to yield 4-lithio-5-bromopyrimidine., Application In Synthesis of 4595-59-9

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Pyrimidine is a nitrogenous base similar to benzene (a six-membered ring) and includes cytosine, thymine, and uracil as bases used for DNA or RNA. 4595-59-9, formula is C4H3BrN2, Name is 5-Bromopyrimidine. Pyrimidine also found in many synthetic compounds such as barbiturates and the HIV drug, zidovudine. Electric Literature of 4595-59-9.

Townsend, Katherine;Huestis, Malcolm P.;Tellis, John C. research published 《 Photoredox/Nickel Dual Catalytic Cross-Coupling of Potassium Thiomethyltrifluoroborates with Aryl and Heteroaryl Bromides》, the research content is summarized as follows. The cross-coupling of S-aryl and S-alkyl potassium thiomethyltrifluoroborates with aryl and heteroaryl bromides is reported via photoredox/nickel dual catalysis. The transformation is achieved under mild conditions with com. available or readily prepared, air stable reagents and affords benzylthioether products in moderate to good yields with good functional group tolerance. A practical and improved synthesis of potassium thiomethyltrifluoroborates is also reported that affords access to previously undescribed reagents.

Electric Literature of 4595-59-9, 5-Bromopyrimidine is a reactive intermediate that is used in the synthesis of 4-methoxyphenylboronic acid. 5-Bromopyrimidine has been shown to be nucleophilic, reacting with β-amino acids under basic conditions to form the corresponding 2-bromo amide. It also undergoes cross-coupling reactions with halides and can be used as a building block for other organic compounds. 5-Bromopyrimidine has optical properties that are characteristic of aromatic molecules, including strong absorption bands in the ultraviolet region and visible light region.
5-Bromopyrimidine undergoes direct metallation with lithuium diisopropylamide to yield 4-lithio-5-bromopyrimidine., 4595-59-9.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. One of the three diazines (six-membered heterocyclics with two nitrogen atoms in the ring), it has the nitrogen atoms at positions 1 and 3 in the ring. 1722-12-9, formula is C4H3ClN2, Name is 2-Chloropyrimidine. The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, including the nucleotides cytosine, thymine and uracil, thiamine (vitamin B1) and alloxan. Name: 2-Chloropyrimidine.

Townley, Chloe;McMurray, Lindsay;Marsden, Stephen P.;Nelson, Adam research published 《 A unified “top-down” approach for the synthesis of diverse lead-like molecular scaffolds》, the research content is summarized as follows. A “top-down” synthetic approach enabled the step-efficient synthesis of 21 diverse novel mol. scaffolds. The scaffolds were derived from four complex intermediates that had been prepared using cycloaddition chem. Scaffold-hopping of these intermediates was achieved through attachment of an addnl. ring, ring cleavage, ring expansion and/or ring fusion. It was shown that the resulting scaffolds could be decorated to yield diverse lead-like screening compounds

Name: 2-Chloropyrimidine, 2-Chloropyrimidine is a monochlorinated pyrimidine with plant growth regulating activity. Chloropyrimidine is a useful reagent in the preparation of antivirals and other biologically active compounds.
2-Chloropyrimidine undergoes cobalt-catalyzed cross-coupling reaction with aryl halides.
2-Chloropyrimidine is a molecule that can be synthesized by the oxidation of pyrimidine with hydrogen peroxide and hydrochloric acid. The reaction proceeds through an electrochemical process in which the oxidation catalyst is a platinum electrode. This reaction is catalyzed by the nucleophilic attack of malonic acid on the chloropyrimidine at the methylene group. This efficient method for making 2-chloropyrimidine has been applied to synthesize aryl halides, including phenyl chloropyrimidine and pyridyl chloropyrimidine, from their corresponding chloride and bromide precursors. The fluorescence properties of 2-chloropyrimidine have been studied in coordination chemistry, where it forms complexes with metal ions such as Mn2+. In this study, it was found that adsorption mechanisms are dependent on molecular size, charge density, kinetic energy, and adsorbent surface area., 1722-12-9.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia