Tag: M.W=0-100

Application of 591-12-8. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Cigar leaf differences from different producing areas based on aroma component analysis. Author is Yu, Hang; Liu, Yanting; Shang, Mengqi; Huang, Guangli; Fang, Yi; Lin, Lin; Qu, Yaling; Zuo, Qiaomei.

In order to investigate the leaf aroma chem. differences for cigar samples from different producing areas, 79 aroma components in 47 cigar samples from different countries were determined In addition, the differences in contents and odor activity values of aroma components among Cuban cigars, foreign non-Cuban cigars and Chinese cigars were compared by significance tests. The results showed that there were significant differences in the contents of 43 aroma components among the cigars from different producing areas, and the differences in the contents of α-curcumene and cedrol were the most significant. The contents of degradation products from chlorophyll and cembranoids in Cuban cigars were higher, those of phenylalanines and labdanums in foreign non-Cuban cigars and that of chlorophyll in Chinese cigars were lower. The 79 aroma components had higher odor activity values in fruit and flower flavors. Cuban cigars had higher odor activity values in herbal spices, fruit, flower and other flavors. Foreign non-Cuban cigars had lower odor activity values in plant, fruit, nut, flower and other flavors. The discriminant functions established by taking the contents of aroma components as variables can distinguish the producing areas of com. cigars.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Effect of processing and storage on the volatile profile of sugarcane honey: A four-year study.HPLC of Formula: 591-12-8.

Sugarcane honey (SCH) is a syrup from Madeira Island recognized by its unique and excellent aroma, associated to volatile organic compounds (VOCs) generated during the well-defined five stages of its traditional making process. The establishment of volatile profile throughout all SCH-making stages during four years, allowed the evaluation of the influence of each stage in the typical characterisitcs of SCH. One hundred eighthy seven VOCs were identified, being associated to several origins and formation pathways. VOCs formed during stage 1 and 2 were originate from raw material, and its oxidation (i.e. enzymic browning) and thermal degradation (i.e. lipid oxidation, Maillard reactions, Strecker degradation). In stage 3 and 4, the caramelization and melanoidin degradation also occurred, while in stage 5, the thermal degradation continues, followed by microbial activity. Chemometric anal. allowed to identify 35 VOCs as potential markers for processing control by the producers and as guarantee of the typicality and authenticity of SCH. Based on the obtained results, we propose for the first time an innovative schematic diagram explaining the potential reactions and pathways for VOCs formation during the different steps of the SCH production

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Category: pyrimidines. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Remote Functionalization of 4-(Alk-1-en-1-yl)-3-Cyanocoumarins via the Asymmetric Organocatalytic 1,6-Addition. Author is Romaniszyn, Marta; Gronowska, Katarzyna; Albrecht, Lukasz.

An organocatalytic 1,6-addition using 4-(alk-1-en-1-yl)-3-cyanocoumarins as acceptors was developed. Dienolates derived from 5-substituted-furan-2(3H)-ones have been employed as pronucleophiles, therefore, enabling the synthesis of hybrid mols. bearing two biol. relevant units I [R = H, 7-MeO, 6-Br, etc.; R1 = Me, allyl, Ph, etc.; R2 = H, Me; R3 = H, Me]. Appropriate design of substrates and the application of quinine-derived catalyst resulted in very good site-selectivity as well as chem. and stereochem. efficiency of the process.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Recommanded Product: 5-Methylfuran-2(3H)-one. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Conversion of Biomass-Derived Methyl Levulinate to Methyl Vinyl Ketone. Author is El Ouahabi, Fatima; Smit, Wietse; Angelici, Carlo; Polyakov, Mykola; Rodemerck, Uwe; Fischer, Christine; Kalevaru, V. Narayana; Wohlrab, Sebastian; Tin, Sergey; van Klink, Gerard P. M.; van der Waal, Jan C.; Orange, Francois; de Vries, Johannes G..

A high-throughput screening exercise testing 60 different catalysts resulted in 5 wt % Pt on sulfided carbon as the best catalyst in the conversion of bio-based Me levulinate (ML) to Me vinyl ketone (MVK) in a gas-phase continuous process. Up to 18% yield of MVK was obtained, but fast catalyst deactivation was observed For a better understanding of the reaction mechanism, the potential reaction intermediates [α-angelica lactone (α-AL), γ-valerolactone, Me Et ketone (MEK), and levulinic acid (LA)] were also fed as starting materials under the same reaction conditions as those used for ML. Of the different pathways possible, the route via AL seems to be the most likely route. Since the side product methanol led to the hydrogenation of MVK to MEK, LA is a better substrate in this reaction toward MVK at a medium reaction temperature Herein, we report the highest yield of MVK (>50%) from LA at 350°C. However, this knowledge of the reaction pathway via AL also opened up the possibility of a high-temperature conversion process of ML to MVK. It was found that ML could be converted to MVK in 71% selectivity at 600°C using 40% CaO on γ-Al2O3 as the catalyst. Here, the catalyst merely serves to accelerate the ring closure of ML to AL, which undergoes an electrocyclic reaction under extrusion of CO to form MVK.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Safety of 5-Methylfuran-2(3H)-one. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Alkene Difunctionalization Triggered by a Stabilized Allenyl Radical: Concomitant Installation of Two Unsaturated C-C Bonds. Author is Wei, Yunlong; Zhang, Hong; Wu, Xinxin; Zhu, Chen.

Radical-mediated difunctionalization of alkenes provides a promising approach to introduce one alkenyl or alkynyl group to target compounds However, simultaneous installation of two unsaturated C-C bonds via alkene difunctionalization remains elusive, attributable to the high instability and transient lifetimes of alkenyl and alkynyl radicals. Herein, we report the photocatalytic 1,2-alkynylalkenylation and 1,2-enynylalkenylation of alkenes for the first time, triggered by the intermol. addition of a stabilized allenyl radical to an alkene. A portfolio of strategically designed, easily accessible dual-function reagents are applied to a radical docking-migration cascade. The protocol has broad substrate scope and efficiently increases the degree of unsaturation

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Deng, Tianyu; Yan, Long; Li, Xinglong; Fu, Yao researched the compound: 5-Methylfuran-2(3H)-one( cas:591-12-8 ).Recommanded Product: 591-12-8.They published the article 《Continuous Hydrogenation of Ethyl Levulinate to 1,4-Pentanediol over 2.8Cu-3.5Fe/SBA-15 Catalyst at Low Loading: The Effect of Fe Doping》 about this compound( cas:591-12-8 ) in ChemSusChem. Keywords: hydrogenation ethyl levulinate pentanediol catalyst iron doping; copper; doping; heterogeneous catalysis; hydrogenation; iron. We’ll tell you more about this compound (cas:591-12-8).

Bimetallic Cu-Fe catalysts with low loading were prepared for hydrogenation of Et levulinate (EL) to 1,4-pentanediol (1,4-PDO). Among them, 2.8Cu-3.5Fe/SBA-15 (Cu/Fe molar ratio of 1:1.5) performed best, capable of converting EL to the key intermediate γ-valerolactone (GVL) at 140 °C with 97 % yield. It can also be used to hydrogenate GVL to 1,4-PDO with 92.6 % selectivity or convert EL to 1,4-PDO in one pot. The high activity of the catalyst at such a low loading was attributed to the highly dispersed metal species and the Fe doping effect. Various characterization methods indicated that Fe acted as both structural and electronic modifier to promote the chem. properties of the Cu species. Besides, the incorporation of Fe provided abundant Lewis acid sites and accelerated the reaction process. CuFeO2 was detected by energy-dispersive X-ray spectroscopy, XPS, and XRD. On the basis of a combination of characterization and reaction kinetics, synergistic catalysis by Cu0 and CuFeO2 is considered to be responsible for the excellent performance of the Cu-Fe catalysts.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

COA of Formula: C5H6O2. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Mechanism research on catalytic pyrolysis of sulfated polysaccharide using ZSM-5 catalysts by Py-GC/MS and density functional theory studies. Author is Jiang, Ding; Xia, Zhen; Wang, Shuang; Li, Hongping; Gong, Xun; Yuan, Chuan; El-Fatah Abomohra, Abd; Cao, Bin; Hu, Xun; He, Zhixia; Wang, Qian.

The mechanisms of primary product formation on catalytic pyrolysis of seaweed sulfated polysaccharide with ZSM-5 were examined in detail by using Py-GC/MS anal. and subsequent d. functional theory. Results showed that furfurals were the main product (50.3%) in bio-oil during the catalytic pyrolysis of sulfated polysaccharides. Furfural (9.1%), 5-(Hydroxymethyl)-2(5 H)-furanone (3.1%) and acetone (3.2%) were defined as typical products of Glucuronic acid unit. 5-Me furfural (41.2%), 5-methyl-2(3 H)-Furanone (0.5%) and 5-Me furan (5.4%) can be converted from rhamnose unit. The subsequent d. functional theory calculation indicated that the catalytic pyrolysis of sulfated polysaccharides by ZSM-5 catalyst could boost the pyrolysis and upgrade the bio-oil quality since the promotion of hydrodeoxygenation on catalytic reactions and ZSM-5 could promote the formation of 5-Me furfural. The hydrogen bonding and van der Waals force interactions improved the pyrolysis pathways and decreased the energy barrier, which promoted the pyrolysis. This study confirmed that ZSM-5 had a catalytic influence on pyrolysis of sulfated polysaccharides through theor. and exptl. anal., which is helpful to understand the formation mechanism of seaweed catalytic pyrolysis products.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, Non-U.S. Gov’t, Organic & Biomolecular Chemistry called Thiosquaramide-catalysed asymmetric double Michael addition of 2-(3H)-furanones to nitroolefines, Author is Yang, Mengchen; Chen, Chen; Yi, Xing; Li, Yuan; Wu, Xiaoqin; Li, Qingshan; Ban, Shurong, which mentions a compound: 591-12-8, SMILESS is O=C1OC(C)=CC1, Molecular C5H6O2, HPLC of Formula: 591-12-8.

New chiral thiosquaramides and their applications in catalytic asym. double addition of 5-methyl-2(3H)-furanones to nitroolefins were described. Enantiomerically enriched 2,4,4-trisubstituted butenolides bearing a quaternary stereogenic center could be smoothly constructed with high diastereoselectivities (up to >99 : 1 dr) and excellent enantioselectivities (up to 95% ee) under mild conditions.

From this literature《Thiosquaramide-catalysed asymmetric double Michael addition of 2-(3H)-furanones to nitroolefines》,we know some information about this compound(591-12-8)HPLC of Formula: 591-12-8, but this is not all information, there are many literatures related to this compound(591-12-8).

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 591-12-8, is researched, SMILESS is O=C1OC(C)=CC1, Molecular C5H6O2Journal, Article, Research Support, N.I.H., Extramural, Research Support, U.S. Gov’t, Non-P.H.S., Organic Letters called Construction of Enantioenriched γ,γ-Disubstituted Butenolides Enabled by Chiral Amine and Lewis Acid Cascade Cocatalysis, Author is Yu, Chenguang; Ji, Peng; Zhang, Yueteng; Meng, Xiang; Wang, Wei, the main research direction is butenolide preparation enantioselective regioselective chemoselective; alkynoic acid aldehyde tandem cyclization amine Lewis catalyst.COA of Formula: C5H6O2.

A cascade cocatalysis strategy for the facile construction of chiral γ,γ-disubstituted butenolides I (R1 = Me, Et; R2 = Ph, 1-naphthyl, 2-furyl, etc.) has been described. The synthetic manifold employs simple alkynoic acids R1CCCH2C(O)2H instead of the preformed silyloxy furans or 5-substituted furan-2(3H)-ones II. In situ formed 5-substituted furan-2(3H)-ones II by AgNO3 or Ph3PAuCl/AgOTf catalyzed cyclization of alkynoic acids can smoothly engage in the subsequent chiral diphenylprolinol TMS-ether catalyzed Michael and Michael-aldol reactions. The cascade process serves as a general approach to chiral quaternary γ,γ-disubstituted butenolides I.

From this literature《Construction of Enantioenriched γ,γ-Disubstituted Butenolides Enabled by Chiral Amine and Lewis Acid Cascade Cocatalysis》,we know some information about this compound(591-12-8)COA of Formula: C5H6O2, but this is not all information, there are many literatures related to this compound(591-12-8).

Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 591-12-8, is researched, SMILESS is O=C1OC(C)=CC1, Molecular C5H6O2Journal, Green Chemistry called Synthesis of water-soluble, fully biobased cellulose levulinate esters through the reaction of cellulose and alpha-angelica lactone in a DBU/CO2/DMSO solvent system, Author is Pei, Min; Peng, Xinwen; Shen, Yuqing; Yang, Yunlong; Guo, Yuanlong; Zheng, Qiang; Xie, Haibo; Sun, Hui, the main research direction is biobased cellulose levulinate ester.SDS of cas: 591-12-8.

Cellulose esters are important cellulose derivatives with good processing ability and material properties. The design and sustainable synthesis of cellulose esters are prime research topics. Herein, cellulose levulinate esters (CLEs) with degrees of substitution (DSs) ranging from 0.15 to 2.04 were simply prepared through an atom-economic reaction between cellulose dissolved in a newly developed 1.8-diazabicyclo[5.4.0]undec-7-ene/dimethyl sulfoxide/carbon dioxide solvent system and alpha-angelica lactone, a biomass-derived and com. available platform chem., without the addition of any external catalysts or condensation reagents. The optimized reaction conditions of 120°C, 0.5 h, and a 5/1 molar ratio of alpha-angelica lactone to the hydroxyl groups in cellulose resulted in CLEs with appropriate DSs and satisfactory material properties. The structures and thermal properties of the CLEs were characterized by NMR spectroscopy, Fourier transform IR spectroscopy, differential scanning calorimetry, and thermal gravimetric anal. to develop an in-depth understanding of the correlations among the chem. structures, thermal properties, and mech. properties. A study of solubility in conventional solvents indicated that the CLEs with appropriate DSs were soluble in water, providing a green processing strategy to prepare CLE films with tensile strengths of up to 72 MPa and elongation at break values of up to 26.7%. The morphologies of the films were characterized by SEM and at. force microscopy. The cytotoxicity of the water-soluble CLEs was also evaluated in vaginal epithelial cells (VK2/E6E7) to identify the potential of the CLEs for biomedical applications.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia