Month: December 2022

Dai, ZengHui published the artcileReactive Diluent Derived from Ferulic Acid for the Preparation of a Fully Biobased Unsaturated Polyester Resin, Recommanded Product: Dimethyl itaconate, the publication is ACS Sustainable Chemistry & Engineering (2020), 8(47), 17379-17386, database is CAplus.

A reactive diluent for the preparation of a fully biobased unsaturated polyester resin (UPR) was developed and is presented here. The diluent, 4-vinylguaiacol acetyl ester (AC4VG), was obtained via a simple two-step synthesis: decarboxylation from ferulic acid (FA) and acetylation of the decarboxylated product, 4-vinylguaiacol (4VG). This diluent shows excellent miscibility with biobased unsaturated polyester prepolymer (UPP) that had been synthesized from succinic acid (SA), 1,3-dihydroxypropane (PD), and itaconic acid (IA). A mixed solution of these possessed a very low viscosity at 174 mPa·s at room temperature when 40 wt% AC4VG was added. Moreover, its vinyl group brought high reactivity for free radical copolymerization with the UPP, and the benzene ring structure enabled a high glass transition temperature (T_g) of the cured UPR. When the fully biobased UPR was reinforced by cotton fabric, a strong tensile strength at the break of approx. 65.8 MPa, a T_g of 135°C, and a T_d5% of 276°C were achieved. This work suggests that the fully biobased UPR reported here is a promising candidate for replacing petroleum-based ones, and the diluent AC4VG played an important role in the performance of this biobased UPR. A biobased reactive diluent, 4-vinylguaiacol acetyl ester, was developed for the preparation of a fully biobased unsaturated polyester resin.

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 C7H10O4, Recommanded Product: Dimethyl itaconate.

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

Chen, Zhijie published the artcileLigand-Directed Reticular Synthesis of Catalytically Active Missing Zirconium-Based Metal-Organic Frameworks, Product Details of C22H23BO4, the publication is Journal of the American Chemical Society (2019), 141(31), 12229-12235, database is CAplus and MEDLINE.

The ligand-directed reticular syntheses and isoreticular expansion of Zr-based metal-organic frameworks (Zr-MOFs) with the edge-transitive alb net from 12-connected hexagonal-prismatic Zr₆ nodes and 6-connected trigonal-prismatic linkers, i.e., microporous NU-1600, mesoporous NU-1601, and mesoporous NU-1602, are reported. These Zr-MOFs exhibit remarkable activities toward the destruction of a nerve agent (soman) and a nerve agent simulant (DMNP). Crystallog. data are given.

Journal of the American Chemical Society published new progress about 1448637-05-5. 1448637-05-5 belongs to esters-buliding-blocks, auxiliary class Alkynyl,Boronic acid and ester,Benzene,Ester,Boronate Esters,Boronic Acids,Boronic acid and ester,, name is Methyl 4-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethynyl)benzoate, and the molecular formula is C22H23BO4, Product Details of C22H23BO4.

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

Draper, William M. published the artcileOrganic Chemical Contaminants in Water System Infrastructure Following Wildfire, Product Details of C42H63O3P, the publication is ACS ES&T Water (2022), 2(2), 357-366, database is CAplus and MEDLINE.

Wildfires have destroyed multiple residential communities in California in recent years. After fires in 2017 and 2018, high concentrations of benzene and other volatile organic compounds (VOCs) were found in public drinking water systems in fire-affected areas. The sources of the contamination and appropriate remediation have been urgent matter of investigation. This study characterizes target and nontarget VOCs and semivolatile organic compounds in water from a highly contaminated service line after the 2018 Camp Fire (Paradise, CA). Ninety-five organic compounds were identified or tentatively identified in the service line. Laboratory combustion experiments with drinking water pipes made of polyvinyl chloride (PVC), cross-linked polyethylene, and high-d. polyethylene and a review of the literature were used to evaluate potential sources of the detected chems. Among the service line contaminants were 32 compounds associated with PVC pyrolysis and 28 organic compounds also associated with the pyrolysis of polyethylene. The service line sample also contained 55 compounds associated with uncontrolled burning of biomass and waste materials. The findings support hypotheses that wildfires can contaminate drinking water systems both by thermal damage to plastic pipes and intrusion of smoke. Residual chlorine disinfectants in the water system modify the contaminant distribution observed

ACS ES&T Water published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Product Details of C42H63O3P.

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

Li, Wenli published the artcileChemical composition analysis of extracts from different parts of Phallus impudicus L. growing in Guizhou province, COA of Formula: C20H40O2, the publication is Shipin Kexue (Beijing, China) (2016), 37(2), 72-76, database is CAplus.

Objective: To find out and expand the utilization potential of Phallus impudicus L. by analyzing the chem. composition of petroleum ether and ethanol extracts from its pileus, stipe and volva. Methods: The volatile components of the pileus, stipe and volva of Phallus impudicus L. were obtained by successive extraction with petroleum ether and ethanol under room temperature (25-30°C). The chem. composition of each extract was identified by gas chromatog.-mass spectrometry (GC-MS) using a polar column HP-INNOWAX. Temperature programming was as follows: initial temperature was set to 60°C hold for 2 min, followed by an increase of 10°C/min to 160°C held for 6 min, and another increase of 3°C/min to 220°C held for 17 min. The spectra were compared with those published in the mass spectral library NIST 08. Results: A total of 67 volatile components were identified from the two different solvent extracts of Phallus impudicus L., 66 compounds of which were first reported in this study. A total of 35 compounds were extracted with petroleum ether from Phallus impudicus L., 24, 18 and 18 of which were identified from the extracts of pileus, stipe and volva, resp. A total of 38 components were extracted from Phallus impudicus L. including 26, 28 and 12 compounds identified from the extracts of pileus, stipe and volva, resp. Conclusions: The presence of 9,12-octadecadienoic acid (Z,Z)-, butylated hydroxytoluene, 1,2-benzenedicarboxylic acid, bis(2-methylpropyl) ester, isosorbide, 1,2-cyclopentanedione, 2-pyrrolidinone, niacinamide, 9,12-octadecadienoic acid, and Et ester can provide the scientific basis for reasonable utilization of Phallus impudicus L.

Shipin Kexue (Beijing, China) published new progress about 110-34-9. 110-34-9 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ester, name is Isobutyl palmitate, and the molecular formula is C20H40O2, COA of Formula: C20H40O2.

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

Liu, Gang published the artcileBenzofused tricycles based on 2-quinoxalinol. [Erratum to document cited in CA146:251809], Application In Synthesis of 19788-49-9, the publication is Journal of Combinatorial Chemistry (2008), 10(2), 343, database is CAplus.

The quinoxalin-2-ol mol. structure published in the article has been recently corrected to be quinoxalin-2-one by X-ray single-crystal anal. of an unambiguous configuration of chem. compound 1, which indicated that it was a 3,4-dihydroquinoxalin-2-one but not a quinoxalin-2-ol. The correct chem. structure for Compound 1 as synthesized by a published standard method is given in supplemental Figure 1.

Journal of Combinatorial Chemistry published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Application In Synthesis of 19788-49-9.

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

Liu, Gang published the artcileBenzofused Tricycles Based on 2-Quinoxalinol, Application of Ethyl 2-mercaptopropanoate, the publication is Journal of Combinatorial Chemistry (2007), 9(1), 70-78, database is CAplus and MEDLINE.

This paper describes our recent efforts to synthesize novel compound scaffolds integrating 2-quinoxalinol with privileged structures of 1,3-dihydrobenzoimidazol-2-one, 1,3-dihydrobenzoimidazole-2-thione, 3-hydroxy-1H-quinoxalin-2-one, 2H-benzo[1,4]oxazin-3-ol, 2H-benzo[1,4]thiazin-3-ol, and 1,3,4,5-tetrahydro-benzo[1,4]diazepin-2-one, resp. Eight novel benzofused tricycles and their substituent diversity points were developed. These include pyrazino[2,3-g]quinoxaline-2,8-diol, 3-hydroxy-6,8,9,10-tetrahydro-1,4,6,10-tetraazacyclohepta[b]naphthalen-7-one, 6-hydroxy-4H-1-oxa-4,5,8-triazaanthracen-3-one, 6-hydroxy-4H-1-thia-4,5,8-triazaanthracen-3-one, 6-hydroxy-1,1-dioxo-1,4-dihydro-2H-1λ⁶-thia-4,5,8-triazaanthracen-3-one, 6-hydroxy-1,3-dihydroimidazo[4,5-g]quinoxalin-2-one, 6-hydroxy-1,3-dihydroimidazo[4,5-g]quinoxaline-2-thione, and 7-hydroxy-1,4-dihydropyrazino[2,3-g]quinoxaline-2,3-dione. This strategy of integrating two benzofused privileged structures into one mol. may provide a greater chance for the discovery of novel lead compounds

Journal of Combinatorial Chemistry published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Application of Ethyl 2-mercaptopropanoate.

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

Cheng, Zihui published the artcileInfluence of linkage and terminal group on the liquid crystalline and helical twisting behaviors of cholesteryl esters, Formula: C15H14O3, the publication is Liquid Crystals (2011), 38(7), 803-812, database is CAplus.

Three series of cholesteryl esters with different linkages and terminal groups were synthesized and characterized. All esters except cholesteryl 6-bromohexanoate can exhibit thermotropic liquid crystalline phases in certain temperature regions. The insertion of a 4-phenoxy and a 4-biphenylyloxy group in the ester can increase the mol. length, broaden the whole mesophase width and heighten the clearing temperature The increasing mol. length can enforce the layered arrangement in series A and B (resulting in a monolayer smectic A phase), while destroying the layer stacking in series C (resulting in a suppressed or absent intertwined smectic A phase). Meanwhile, the mol. structure played an important role in the molar helical twisting power and its temperature dependence. The target compounds thus formed included cholesterol esters, (3β)-cholest-5-en-3-ol 3-[6-(2-naphthalenyloxy)hexanoate] and (3β)-cholest-5-en-3-ol 3-[6-[(4′-cyano[1,1′-biphenyl]-4-yl)oxy]hexanoate] and corresponding benzoate and biphenylcarboxylate derivatives

Liquid Crystals published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Formula: C15H14O3.

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

Bi, Xiaojing published the artcileDCDMH-promoted synthesis of thiophosphates by coupling of H-phosphonates with thiols, Product Details of C5H10O2S, the publication is Tetrahedron (2016), 72(5), 706-711, database is CAplus.

DCDMH-mediated (1,3-dichloro-5,5-dimethylhydantoin) phosphorylation of versatile thiols with H-phosphonates for the preparation of synthetically and biol. important thiophosphates was demonstrated. Without metal catalysts and other additives, phosphorylation occurred to give the desired products with good to excellent yields within 10 min at ambient temperature in the air.

Tetrahedron published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Product Details of C5H10O2S.

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

Yang, Wenjun published the artcileMacromolecular iniferter, HPLC of Formula: 3052-61-7, the publication is Gaofenzi Xuebao (1994), 636-40, database is CAplus.

Polystyrene and polyacrylamide prepared by benzyl diethyldithiocarbamate could be used as macromol. iniferter and could further initiate styrene or acrylamide polymerization The results showed that chain enlargement reaction in homogeneous systems had the characteristics of living radical polymerization and the products still contained iniferter functional groups. Polystyrene macromol. iniferter can initiate acrylamide polymerization in dioxane and the polystyrene-block-polyacrylamide copolymers were obtained. The blocking efficiency and polymerization activity were high.

Gaofenzi Xuebao published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C17H19N3O7S, HPLC of Formula: 3052-61-7.

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

Zhang, Feihong published the artcileInhibitory effect of antioxidants on biodiesel crystallization: Revealing the role of antioxidants, Computed Properties of 121-79-9, the publication is Fuel (2021), 120782, database is CAplus.

Effect of six antioxidants (butylated hydroxytoluene, Bu hydroxyanisole, di-tert-butylhydroquinone, tert-Bu hydroquinone, Pr gallate, and pyrogallic acid) on crystallization properties of biodiesel was systematically investigated. Results showed that all the six antioxidants effectively inhibited biodiesel crystallization at low temperatures as reflected by the decrease of cold filter plugging point by 1 ∼ 3°C, solid fat content by 0.01 ∼ 2.30%, crystallization rate from 10^-4 to 10^-5 ∼ 10^-6 k/min, crystal size from 214 x 14 ∼ 357 x 43 to 71 x 14 ∼ 286 x 29 (length x width, μm x μm), the absolute values of crystallization enthalpy changes by 1.5 ∼ 5.5 J/g. The min. concentrations of antioxidants for biodiesel to reach the induction period (8 h) regulated by the European Union standard were 500 mg/kg for TBHQ, PG, and PY, 1000 mg/kg for BHA and DBHQ, and 2000 mg/kg for BHT, resp. Antioxidants were inserted between initial crystal nucleuses through hydrogen bonds. The large steric hindrance of antioxidants inhibited the clustering of initial crystal nucleuses, thus inhibiting the growth of Me ester crystals. Biodiesel with the six antioxidants all had the same crystalline form (two-dimensional flake crystals). The weaker inhibitory effect of BHA than the other five antioxidants which didn’t present significant difference in inhibiting biodiesel crystallization was because the methoxy group of BHA cannot form a hydrogen bond well with the carbonyl group of Me ester mol.

Fuel published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C13H9FO, Computed Properties of 121-79-9.

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