Tag: M.W=150-200

Xu, Dan published the artcileSelective oxidation of alcohols to high value-added carbonyl compounds using air over Co-Co₃O₄@NC catalysts, Related Products of esters-buliding-blocks, the publication is Chemical Engineering Journal (Amsterdam, Netherlands) (2022), 134545, database is CAplus.

The sustainable catalytic transformation of alcs. to high value-added fine chems. is a significant and challenging research topic. Herein, a set of nitrogen-doped carbon encapsulated Co-based catalysts (Co-Co₃O₄@NC-T) were prepared by using low-cost dicyandiamide, glyoxal and cobalt nitrate as precursors. The obtained catalysts were utilized for the selective oxidation of alcs. to high value-added esters and carboxylic acids with air as the oxygen source and displayed wide applicability for the oxidation of both aromatic and aliphatic alcs. Based on the controlled experiments, the protective effect of N-doped carbon structure and the synergistic effect between Co core and Co₃O₄ species guaranteed the high reaction conversion and selectivity. Benefitting from heterogeneity and magnetism of the catalyst, it can be easily recycled and reused for long-term stability. Reasonable mechanisms of selective oxidation reaction were proposed through EPR anal. and controlled experiments The present work provides a facile strategy for potential large-scale preparation of heterogeneous catalyst for sustainable and green catalytic transformations.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C5H10O2S, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Yu, Jin-Feng published the artcileCu-Mediated Amination of (Hetero)Aryl C-H bonds with NH Azaheterocycles, HPLC of Formula: 1877-71-0, the publication is Angewandte Chemie, International Edition (2019), 58(50), 18141-18145, database is CAplus and MEDLINE.

Direct synthesis of N-(hetero)arylated heteroarenes has been realized through Cu-mediated C-N coupling of NH azaheterocycles with aryl C-H bonds under aerobic conditions. This method features a broad scope of both heterocyclic arenes (pyridine, quinoline, pyrazole, imidazole, furan, thiophene, benzofuran, and indole) and NH azaheterocycles (imidazole, pyrazole, indole, azaindole, purine, indazole, benzimidazole, pyridone, carbazole), providing a versatile method for the synthesis of pharmaceutically important N-(hetero)arylated heteroarenes. The versatility of this reaction was further demonstrated through late-stage modification of marketed drugs and the synthesis of a key intermediate for accessing a class of angiotensin II receptor 1 antagonists.

Angewandte Chemie, International Edition published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C10H15NO, HPLC of Formula: 1877-71-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ma, Fei published the artcileDNA-Encoded Libraries: Hydrazide as a Pluripotent Precursor for On-DNA Synthesis of Various Azole Derivatives, COA of Formula: C9H8O4, the publication is Chemistry – A European Journal (2021), 27(31), 8214-8220, database is CAplus and MEDLINE.

A phylogenic chem. transformation strategy using DNA-conjugated benzoyl hydrazine as a common versatile precursor in azole chem. expansion of DNA-encoded combinatorial chem. library (DEL) has been described. DNA-compatible reactions deriving from the common benzoyl hydrazines, e.g., I (R = DNA) precursor showed excellent functional group tolerance with exceptional efficiency in the synthesis of various azoles, including oxadiazoles, e.g., II thiadiazoles, and triazoles, under mild reaction conditions. The phylogenic chem. transformation strategy provides DELs a facile way to expand into various unique chem. spaces with privileged scaffolds and pharmacophores.

Chemistry – A European Journal published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C9H8O4, COA of Formula: C9H8O4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Shi, Hongwei published the artcileCatalyst- and additive-free sunlight-induced autoxidation of aldehydes to carboxylic acids, Related Products of esters-buliding-blocks, the publication is Green Chemistry (2022), 24(15), 5835-5841, database is CAplus.

A catalyst- and additive-free sunlight-induced strategy for autoxidation of a wide range of aldehydes RCHO (R = Bu, cyclohexyl, Ph, pyridin-3-yl, etc.) to carboxylic acids RC(O)OH is described for the first time. In this oxidation system, air serves as the source of oxygen and sunlight as the light source, and the system includes the advantages of green, highly atom-efficient, and low-cost synthesis. This method was easily applied even at gram scale. The reaction proceeds smoothly even at lower temperature and in natural light.

Green Chemistry published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C8H16O2, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ramnauth, Jailall published the artcilePhotochemical preparation of cyclopropanes from cyclobutanones, Formula: C12H14O2, the publication is Canadian Journal of Chemistry (2001), 79(2), 114-120, database is CAplus.

A general method for the preparation of cyclopropanes is reported. Triplet-photosensitized reactions of cyclobutanones give cyclopropanes as the major product. Part 1 describes the synthesis of substituted cyclobutanones used. In Part 2, the photo-reactions of cyclobutanones are reported. Triplet-sensitized reactions of cyclobutanones using acetone as a sensitizer give cyclopropanes as the major nonpolar products. The extent of photodecarbonylation seems to be dependent on α-substitution. Electron-donating groups promote decarbonylation while electron-withdrawing groups favor cycloelimination.

Canadian Journal of Chemistry published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Formula: C12H14O2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

de Oliveira, Naiara Araujo published the artcile1,3,5-triacryloylhexahydro-1,3,5-triazine improves antibacterial and physicochemical properties of an experimental resin-based cement, Computed Properties of 10287-53-3, the publication is International Journal of Adhesion and Adhesives (2022), 117(Part_A), 103157, database is CAplus.

Stable antibacterial cement could contribute to reducing the biofilm formation for a healthy marginal sealing in high-risk areas in indirect restorations. This study aimed to incorporate 1,3,5-triacryloylhexahydro-1,3,5-triazine (TAT) on exptl. resin-based cements and evaluate its antibacterial and physicochem. properties. An exptl. resin-based cement was formulated with 50 wt% Bisphenol A-Glycidyl Methacrylate (BisGMA), 30 wt% Urethane Dimethacrylate (UDMA), 20 wt% Triethylene Glycol Dimethacrylate (TEGDMA), and initiators. Barium silicate glass was used as a filler (45 wt%) and two different groups were tested: CTAT with 15 wt% TAT addition and CCONTROL with no TAT addition The developed cements were evaluated by their degree of conversion, film thickness, flow, flexural strength, softening solvent, cytotoxicity, and antibacterial activity. Microshear bond strength (μSBS) was evaluated regarding dental tissues, glass-ceramics, and polycrystalline ceramics. CTAT showed a higher degree of conversion, lower cytotoxicity, lower softening solvent, and an increased film thickness when compared to CCONTROL. No statistical difference was found between the groups for flow, flexural strength, planktonic antibacterial anal., and cytotoxicity. Reduced biofilm formation was observed in the CTAT group. CTAT improved the μ SBS values for a polycrystalline ceramic substrate. The addition of 1,3,5-triacryloylhexahydro-1,3,5-triazine showed anti-biofilm activity, increased degree of conversion, decreased cytotoxicity, and increased bond strength for IPS-YTZP substrate tested.

International Journal of Adhesion and Adhesives published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Computed Properties of 10287-53-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

de Souza, Jaqueline F. published the artcilePhosphine-Functionalized Chitosan Microparticles as Support Materials for Palladium Nanoparticles in Heck Reactions, Formula: C10H10O2, the publication is Catalysis Letters, database is CAplus.

Herein, we investigated the activation and stabilization of Pd nanoparticles using microparticles of chitosan-functionalized with phosphine moieties. The catalytic activity of the prepared material was assessed in a series of Heck reactions, which demonstrated the potential of our catalyst concerning yields and reaction scope. Comparative experiments confirmed the superior performance of the phosphine-modified material with respect to a similar catalyst derived from non-functionalized chitosan. Finally, the prepared catalyst also exhibited appreciable activity even after four consecutive reaction runs, with minimal loss of Pd by leaching.

Catalysis Letters published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Formula: C10H10O2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Fang, Wan-Yin published the artcileSO₂F₂-Mediated One-Pot Synthesis of Aryl Carboxylic Acids and Esters from Phenols through a Pd-Catalyzed Insertion of Carbon Monoxide, Safety of 3-(Methoxycarbonyl)benzoic acid, the publication is Chemistry – An Asian Journal (2017), 12(17), 2323-2331, database is CAplus and MEDLINE.

A one-pot Pd-catalyzed carbonylation of phenols into their corresponding aryl carboxylic acids and esters through the insertion of carbon monoxide has been developed. This procedure offers a direct synthesis of aryl carboxylic acids and esters from inexpensive and abundant starting materials (phenols, SO₂F₂ and CO) under mild conditions. This method tolerates a broad range of functional groups and is also applicable for the modification of complicated natural products.

Chemistry – An Asian Journal published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C9H8O4, Safety of 3-(Methoxycarbonyl)benzoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wu, Di published the artcile4D Printing of a Fully Biobased Shape Memory Copolyester via a UV-Assisted FDM Strategy, Application of Dimethyl itaconate, the publication is ACS Sustainable Chemistry & Engineering (2022), 10(19), 6304-6312, database is CAplus.

The emergence of 4D-printing technol. provides a new opportunity for the development of shape memory polymers (SMPs) with sophisticated or individualized architectures in the most material-saving way. Fused deposition modeling (FDM) has been regarded as a feasible and facile printing technol. to print thermoplastics, but the low adhesion between interlayers of the obtained objects is an unavoidable problem caused by its printing principle. Fortunately, abundant biobased chems. with a variety of reactive groups make it easy to design ecofriendly linear SMPs with active sites, which are ready for in situ reactions during FDM printing. Herein, we developed fully biobased shape memory copolyesters (PBSe-co-PBIs) by polycondensation of di-Me itaconate, di-Me sebacate, and 1,4-butanediol. The flexible and crystalline PBSe may serve as a mol. switch to ensure the desirable shape memory effect (SME) of the materials, and the PBI moiety with double bonds forming crosslinking points between layers during the printing process under UV irradiation acts as net points for SMPs and enhances interlayer adhesion. The shape memory performance and the enhanced interlayer adhesion of printed materials by this strategy were verified by DMA anal. and tensile tests. Finally, a 4D-printed “Sanxingdui bronze mask” and an overheating protection cover were demonstrated, which indicated a great potential in high-temperature protection devices.

ACS Sustainable Chemistry & Engineering published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C18H35NO, Application of Dimethyl itaconate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Maguet, Louis published the artcileEsterification of 3-methyl-1,3-butanediol, Category: esters-buliding-blocks, the publication is Bulletin de la Societe Chimique de France (1965), 3262-6, database is CAplus.

A method is described for the diesterification of Me₂C(OH)CH₂CH₂OH (I) by organic acid anhydrides without the dehydration of the tertiary OH. I was also converted to the corresponding Me₂C(OH)CH₂CH₂O₂CR (II) and Me₂C:CHCH₂O₂CR (III) and(or) CH₂:CMeCH₂CH₂O₂CR (IV). I (104 g.) and 102 g. Ac₂O kept 1 hr. slightly below 70° and heated 1 hr. at 147° yielded 94% II (R = Me) (V), b₂₀ 105°, n²⁰_D 1.4300, d₂₅ 0.9993. I (38 g.) and 81 g. (C₆H₁₃CO)₂O (VI) in 63 g. MePh refluxed 6 hrs. gave 87% II (R = C₆H₁₃) (VII), b_0.15 87-93°, n²⁰_D 1.4412. I (114 g.), 150 cc. C₆H₆, and 110 g. Na₂CO₃ treated during 2 hrs. at 60° with 148 g. C₆H₁₃COCI (VIIa) and heated 2 hrs. at 60-70° yielded 137 g. VII, b_0.60 105°, n²⁰_D 1.4411, d₂₅ 0.9336. I with BzCl gave similarly during 4 hrs. 68% II (R = Ph) (VIII), b_0.9 127-8°, n²_D⁰ 1.5138, d₂₅ 1.0762. I (156 g.), 142 g. C₁₇H₃₅CO₂H, 77 cc. xylene, and 3 g. Al₂O₃ refluxed 17 hrs. with the azeotropic removal of H₂O yielded 116 g. II (R = C₁₇H₃₅), m. 40° (heptane). C₈H₁₇CH:CH(CH₂)₇CO₂Me (169 g.) and 119 g. I distilled to remove 10 cc. I, treated with a piece of K, heated to 180° with the overhead removal of the MeOH, treated with 0.8 g. K in small pieces at intervals during 5 hrs., and distilled gave 70% II [R = C₈H₁₇CH:CH(CH₂)₇], b_0.03 178-85°, n²⁰_D 1.4623, d₂₅ 0.9045. I (86 g.) added dropwise during 15 min. to 132.6 g. refluxing Ac₂O yielded 115 g. IV (R = Me) (IX), b₇₆₀ 143-5°, n²⁰_D 1.4212, d₂₅ 0.9137. I (104 g.), 71 g. AcOH, 150 cc. C₆H₆, and 1 g. PhSO₃H refluxed 5 hrs. with the azeotropic removal of H₂O yielded 74 g. mixture, b₄₀ 63-72°, of 80% IX and 20% III (R = Me) (X). V (22.2 g.) in 50 cc. MePh refluxed with 1% iodine gave isoprene and only 30% mixture of IX and X; a similar run in C₆H₆ with C₁₀H₇SO₃H yielded 50% mixture of 85% IX and 15% X. C₆H₁₃CO₂H (65 g.), 57 g. I, 135 cc. C₆H₆, and 0.6 g. C₁₀H₇SO₃H gave similarly 49 g. 80:20 mixture of IV (R = C₆H₁₃) (XI) and III (R = C₆H₁₃) (XII), b_1.7 84-87°, n²⁰_D 1.4378, d₂₅ 0.879, and 18g. 65:35 mixture of XI and XII, b_1.787-95°. BzOH (183 g.), 172 g. I, 300 cc. C₆H₆, and 1 g. PhSO₃H refluxed 13 hrs. yielded after 11 g. forerun, b_0.2 45-56°, n²⁰_D 1.4608, 34.5 g. mixture, b_0.2 60-4°, n²⁰_D 1.5093, d₂₅ 1.0125, of IV (R = Ph) (XIII) and III (R = Ph) (XIV) containing mostly XIII, and 24 g. mixture, b_0.2 64-5°, n_20D 1.5118, of XIII and XIV containing mostly XIV. CH₂: CMeCH₂CH₂OH (35 g.), 50 cc. CHCl₃, and 29 g. C₅H₅N treated dropwise during 2 hrs. with 101 g. C₁₇H₃₅COCl in 100 cc. CHCl₃ at 30-40° and refluxed 2 hrs. yielded 95 g. IV (R = C₁₇H₃₅), n²⁰_D 1.4518, d₂₀ 0.8670. Similarly was prepared from oleyl chloride 71% IV [R = C₈H₁₇CH:CH(CH₂)₇], b_0.01 150-65°, n²⁰_D 1.4605, d₂₀ 0.8765. Ac₂O (1326 g.) treated at reflux with 520 g. I yielded 797 g. Me₂C (O₂CR)CH₂CH₂O₂CR’ (XV) (R = R’ = Me), b₁₉ 108-9°, n²⁰_D 1.4247, d₂₅ 1.0189, and a small amount of a mixture of 63% IX and 37% X. I (26 g.), 156 g. VI, and 80 g. MePh refluxed 13 hrs. yielded 61.5 g. XV (R = R’ = C₆H₁₃) (XVI), b_0.1 128-34°, n²⁰_D 1.4418. I (36.4 g.) in 150 cc. CHCl₃ and 100 cc. C₅H₅N treated dropwise with stirring during 3 hrs. with 119 g. VIIa at 30° and heated 5 hrs. at 60° yielded 100 g. XVI, b_0.15 130-5°, n²⁰_D 1.4418, d₂₅ 0.9256. I (47 g.) with 135 g. BzCl gave similarly 31 g. distillate, b. 120-2°, containing mostly VIII and 82 g. XV (R = R’ = Ph), m. 34° (AmOH), d₂₅ 1.1212. VIII (104 g.) and 67 g. Ac₂O heated 5 hrs. at 140° yielded 112 g. XV (R = Me, R’ = Ph), b_0.85 131-2°, n²⁰_D 1.4974, d₂₅ 1.0820. Similarly were prepared the following XV (R = Me) (R’, % yield, b.p./mm. or m.p., n²⁰_D, and d₂₀ given): C₆H₁₃, 94, 109-10°/0.6, 1.4360, 0.95874; C₈H₁₇CH:CH(CH₂)₇, 95, –, 1.4582, 0.92084; C₁₇H₃₅, 98, 24-5°, –, –.

Bulletin de la Societe Chimique de France published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics