Category: 591-12-8

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, New Journal of Chemistry called Enantioselective vinylogous Michael addition of β,γ-unsaturated butenolide to 2-iminochromenes, Author is Gupta, Vijay; Singh, Ravi P., the main research direction is furanone aminochromene carbonitrile enantioselective diastereoselective preparation; iminichromene unsaturated butenolide Michael addition.Application of 591-12-8.

An efficient organocatalyzed asym. synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles via vinylogous Michael addition of non-activated β,γ-unsaturated butenolide to 2-iminochromenes was realized.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Antimicrobial properties and volatile profile of bread and biscuits melanoidins, published in 2022-03-30, which mentions a compound: 591-12-8, Name is 5-Methylfuran-2(3H)-one, Molecular C5H6O2, Product Details of 591-12-8.

This work gives novel information about the antimicrobial effect and volatiles of melanoidins isolated from Maria biscuit, common and soft bread. Melanoidins were isolated from scraped and sieved crusts (1 mm), after gluten digestion, 10 kDa ultrafiltration, and diafiltration. Finally, they were freeze-dried. Headspace solid-phase dynamic extraction coupled with a gas chromatograph with a mass spectrometer was used to determine the volatile profiles. The antimicrobial effect was evaluated against isolated strains of the most relevant food spoilage and pathogen microorganisms, together with some molds and yeasts. Melanoidins from common bread exhibited the most extensive antimicrobial activities and showed the most composite volatile profile. No undesirable compounds, such as furfural and 5-hydroxy-methyl-furfural, were found in any of the melanoidins studied. The obtained data pointed out that bakery melanoidins can exert effective food technol. properties as natural antimicrobials that can improve shelf-life and security of foodstuffs, together with a possible contribution to food aroma.

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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.Peddakasu, Ganga Bhavani; Velisoju, Vijay Kumar; Kandula, Manasa; Gutta, Naresh; VR Chary, Komandur; Akula, Venugopal researched the compound: 5-Methylfuran-2(3H)-one( cas:591-12-8 ).Quality Control of 5-Methylfuran-2(3H)-one.They published the article 《Role of group V elements on the hydrogenation activity of Ni/TiO2 catalyst for the vapour phase conversion of levulinic acid to γ-valerolactone》 about this compound( cas:591-12-8 ) in Catalysis Today. Keywords: hydrogenation nickel TiO2 catalyst vapor levulinate valerolactone. We’ll tell you more about this compound (cas:591-12-8).

Influence of group V elements such as Ta, Nb and V on the product distribution in the vapor phase hydrogenation of levulinic acid (LA) over Ni/TiO2 catalyst was examined at ambient pressure. The Nb promoted Ni/TiO2 demonstrated a high selectivity towards γ-valerolactone (GVL) compared to other catalysts at 275 °C. The TPR results showed a lower H2 uptake over Ta and V modified Ni/TiO2 which was explained due to a strong interaction between these oxide species with nickel. Presence of a high ratio of ionic nickel (Ni2+) on Ta and V modified catalyst could be a possible reason for the formation of valeric acid (VA) through the ring opening of GVL. The high GVL selectivity over the Ni-Nb/TiO2 catalyst attributed to the presence of a high proportion of Lewis acid sites in conjunction with finely dispersed Ni species on the catalyst surface. This however, is accomplished by the pyridine adsorbed diffuse reflectance IR Fourier transform spectroscopy (DRIFTS) and CO-chemisorption results.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

SDS of cas: 591-12-8. 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 Diastereoselective multi-component tandem condensation: synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles. Author is Gupta, Vijay; Sahu, Debashish; Jain, Shailja; Vanka, Kumar; Singh, Ravi P..

A general strategy for a one-pot stereoselective synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles by reaction of salicylaldehyde, malononitrile and butenolides via a tandem Knoevenagel/Pinner/vinylogous Michael condensation is presented. The β,γ-butenolides gave a syn-selective MCR adduct with a dr up to 11.5 : 1. The mechanistic insight into the MCR was obtained by DFT calculations

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 591-12-8, is researched, Molecular C5H6O2, about Photo-Thermo-Dual Catalysis of Levulinic Acid and Levulinate Ester to γ-Valerolactone, the main research direction is photo thermo dual catalysis levulinic acid levulinate ester valerolactone.Safety of 5-Methylfuran-2(3H)-one.

Herein, we developed photo-thermo-dual catalytic strategies for the production of γ-valerolactone (GVL) from levulinic acid (LA) and its ester using platinum-loaded TiO2 as a dual-functional catalyst. Both catalytic systems were evaluated under mild reaction conditions. In the photocatalysis system, a base plays crucial roles in the conversion of LA and EL to GVL. The control experiments reveal that plausible mechanistic pathways of both systems proceed via the hydrogenation of the ketone group of LA to the corresponding alc. as a major intermediate followed by a subsequent cyclization step to GVL. This dual-functional catalyst provides alternative strategies for the conversion of LA and its ester into GVL, which could pave the way for biomass utilization in a more effective and practical manner.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Safety of 5-Methylfuran-2(3H)-one. 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 Microwave-assisted catalytic upgrading of bio-based furfuryl alcohol to alkyl levulinate over commercial non-metal activated carbon. Author is Wang, Yantao; Zhao, Deyang; Triantafyllidis, Konstantinos S.; Ouyang, Weiyi; Luque, Rafael; Len, Christophe.

A cheap and com. available non-metal activated carbon (AC) as an efficient catalyst for the alcoholysis of furfuryl alc. (FA) to alkyl levulinate (AL) under microwave assistance was firstly investigated. The catalyst gave an impressive Me levulinate (ML) yield of 78% in only 5 min at 170 °C in the presence of FA (0.2 M, 3 mL) and AC (100 mg). Various reaction parameters in dependence of time such as temperature, catalyst and feedstock loadings as well as solvent types have been optimized. The re-utilization experiments of the catalyst showed that the activity related to the acidic groups of the catalysts, and the deactivation was due to the leaching of acidic specie, which was easily extracted by the solvent. Note that extremely low concentration of the active species extracted from AC (less than 1 wt %) could also give 62% ML yield. The present study provided a promising way for AL synthesis over cheap, com. available and environmentally benign catalyst.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Related Products of 591-12-8. 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 Synthesis of Chiral γ,γ-Disubstituted γ-Butenolides via Direct Vinylogous Aldol Reaction of Substituted Furanone Derivatives with Aldehydes. Author is Sakai, Takaaki; Hirashima, Shin-ichi; Matsushima, Yasuyuki; Nakano, Tatsuki; Ishii, Daiki; Yamashita, Yoshifumi; Nakashima, Kosuke; Koseki, Yuji; Miura, Tsuyoshi.

In the presence of a quinine-derived squaramide-sulfonamide, aldehydes RCHO (R = 4-ClC6H4, 3-ClC6H4, 2-ClC6H4, 4-BrC6H4, 4-F3CC6H4, Ph, 4-MeC6H4, 4-MeOC6H4, 1-naphthyl, 2-naphthyl, 2-furanyl, cyclohexyl, BuCH2) underwent regioselective, diastereoselective, and enantioselective vinylogous aldol addition reactions with γ-substituted β,γ-butenolides such as γ-angelica lactone to yield anti-(hydroxymethyl)butenolides such as I (R = 4-ClC6H4, 3-ClC6H4, 2-ClC6H4, 4-BrC6H4, 4-F3CC6H4, Ph, 4-MeC6H4, 4-MeOC6H4, 1-naphthyl, 2-naphthyl, 2-furanyl, cyclohexyl, BuCH2) in up to 95% ee.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Efficient formation of γ-valerolactone in the vapor-phase hydrogenation of levulinic acid over Cu-Co/alumina catalyst, published in 2020-05-31, which mentions a compound: 591-12-8, Name is 5-Methylfuran-2(3H)-one, Molecular C5H6O2, Synthetic Route of C5H6O2.

Vapor-phase hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) was investigated over Al2O3-supported bimetallic Cu-Co catalysts with different Cu/Co weight ratios under ambient H2 pressure. The bimetallic Cu-Co/Al2O3 catalyst with a Cu/Co weight ratio of 8/12 exhibits an excellent catalytic activity and stability: it showed a high GVL productivity of 5.46 kg kg-1cat. h-1 with a GVL selectivity higher than 99% at 250°C for 24 h. In the characterization of the catalysts, powder X-ray diffraction suggests that bimetallic Cu-Co particles on the Cu-Co/Al2O3 catalysts are composed of an alloy.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Recommanded Product: 591-12-8. 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. Compound: 5-Methylfuran-2(3H)-one, is researched, Molecular C5H6O2, CAS is 591-12-8, about Combined targeted and untargeted profiling of volatile aroma compounds with comprehensive two-dimensional gas chromatography for differentiation of virgin olive oils according to variety and geographical origin.

Comprehensive two-dimensional gas chromatog. with time-of-flight mass spectrometry (GC × GC-TOF-MS) was combined with conventional mono-dimensional GC-MS to differentiate Croatian virgin olive oils (VOO) according to variety and geog. origin, based on the profile of volatile aroma compounds isolated by HS-SPME. More than 1000 compounds were detected after untargeted profiling and 256 were identified or tentatively identified, providing one of the most detailed profiles of volatile aroma compounds in VOO up to date. Among them, 131 volatile compounds were significantly different across monovarietal VOOs, while 60 were found useful for the discrimination according to geog. origin. Many major lipoxygenase and minor non-lipoxygenase-generated compounds were shown to have discriminating ability with respect to both factors. Multivariate statistical anal. extracted twenty-one volatile markers with the highest discriminant power for varietal differentiation. The approach reported may have practical application in better understanding, defining, managing, and communicating the varietal or geog. typicity of monovarietal VOOs.

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Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia