Tag: M.W=150-200

Sousa-Lima, Rodolfo published the artcileMonomer conversion, release and cytotoxicity analyses of experimental GDMA-P based adhesives, Application of Ethyl 4-dimethylaminobenzoate, the publication is International Journal of Adhesion and Adhesives (2021), 102792, database is CAplus.

This study aimed to evaluate the effects of a photoinitiator system and acidic monomer (GDMA-P) concentrations on self-etch exptl. dental adhesive degree of conversion (DC), monomer release and cytotoxicity. Three monomer blends containing different GDMA-P/HEMA/UDMA ratios were produced: 1/3/3; 2/3/2; and 3/3/1. CQ + EDMAB; BAPO or CQ + BAPO + EDMAB were used as photoinitiator systems. DFI was added as co-initiator, and a water/ethanol mixture was used as solvent. DC was evaluated by Fourier transform IR spectroscopy (FTIR) (n = 10). Monomer release was identified by ultra-high performance liquid chromatog. (UHPLC) (n = 6). The Alamar Blue assay was used to test NIH-3T3 fibroblast cell viability (n = 8). A two-way ANOVA and Tukey post-hoc test were used for the data analyses (p < 0.05). Exptl. adhesives presenting higher GDMA-P concentrations displayed an overall statistically lower DC, less monomer release and increased cell viability (p < 0.05). BAPO resulted in increased DC and lower monomer release rates than CQ only (p < 0.05). Low GDMA-P concentrations associated to BAPO generated an adhesive system with improved conversion and both lower monomer release rates and cytotoxicity.

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 C5H10N2OS, Application of Ethyl 4-dimethylaminobenzoate.

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

Farag, Mohamed A. published the artcileComparative Metabolite Fingerprinting of Four Different Cinnamon Species Analyzed via UPLC-MS and GC-MS and Chemometric Tools, COA of Formula: C10H10O2, the publication is Molecules (2022), 27(9), 2935, database is CAplus and MEDLINE.

The present study aimed to assess metabolites heterogeneity among four major Cinnamomum species, including true cinnamon (Cinnamomum verum) and less explored species (C. cassia, C. iners, and C. tamala). UPLC-MS led to the annotation of 74 secondary metabolites belonging to different classes, including phenolic acids, tannins, flavonoids, and lignans. A new proanthocyanidin was identified for the first time in C. tamala, along with several glycosylated flavonoid and dicarboxylic fatty acids reported for the first time in cinnamon. Multivariate data analyses revealed, for cinnamates, an abundance in C. verum vs. procyandins, dihydro-coumaroylglycosides, and coumarin in C. cassia. A total of 51 primary metabolites were detected using GC-MS anal. encompassing different classes, viz. sugars, fatty acids, and sugar alcs., with true cinnamon from Malaysia suggested as a good sugar source for diabetic patients. Glycerol in C. tamala, erythritol in C. iners, and glucose and fructose in C. verum from Malaysia were major metabolites contributing to the discrimination among species.

Molecules 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, COA of Formula: C10H10O2.

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

Nepal, Prabin published the artcilePolycationic Rh-JosiPhos Polymers Supported on Phosphotungstic Acid/Al₂O₃ by Multiple Electrostatic Attractions, Category: esters-buliding-blocks, the publication is ACS Catalysis (2022), 12(3), 2034-2044, database is CAplus.

Cationic Rh-JosiPhos complexes were tethered to crowded, ring-opening olefin metathesis (ROMP)-active norbornene groups. These monomers underwent facile, alternating ROMP (alt-ROMP) with cyclooctene as the co-monomer catalyzed by RuCl₂(:CHPh)(PCy₃)₂ to form linear, polycationic copolymers. The polymers were readily absorbed by phosphotungstic acid (PTA) on Al₂O₃ via multiple electrostatic attractions between the cationic Rh centers in the polymer and the PTA anions on the Al₂O₃ support. The enantioselective hydrogenation of di-Me itaconate occurred with 100% conversion, 5000 turnovers per run, with up to 96% ee, and without significant Rh leaching over 10 reuses of the catalyst.

ACS Catalysis 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, Category: esters-buliding-blocks.

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

Payne, Jack M. published the artcileVersatile Chemical Recycling Strategies: Value-Added Chemicals from Polyester and Polycarbonate Waste, Related Products of esters-buliding-blocks, the publication is ChemSusChem (2022), 15(8), e202200255, database is CAplus and MEDLINE.

Zn^II-complexes bearing half-salan ligands were exploited in the mild and selective chem. upcycling of various com. polyesters and polycarbonates. Remarkably, we report the first example of discrete metal-mediated poly(bisphenol A carbonate) (BPA-PC) methanolysis being appreciably active at room temperature Indeed, Zn(2)₂ and Zn(2)Et achieved complete BPA-PC consumption within 12-18 mins in 2-Me-THF, noting high bisphenol A (BPA) yields (S_BPA=85-91%) within 2-4 h. Further kinetic anal. found such catalysts to possess k_app values of 0.28±0.040 and 0.47±0.049 min^-1 resp. at 4 wt%, the highest reported to date. A completely circular upcycling approach to plastic waste was demonstrated through the production of several renewable poly(ester-amide)s (PEAs), based on a terephthalamide monomer derived from bottle-grade poly(ethylene terephthalate) (PET), which exhibited excellent thermal properties.

ChemSusChem published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Related Products of esters-buliding-blocks.

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

Ali, Mohammad Asif published the artcileHigh-Performance BioNylons from Itaconic and Amino Acids with Pepsin Degradability, SDS of cas: 617-52-7, the publication is Advanced Sustainable Systems (2022), 6(2), 2100052, database is CAplus.

The use of renewable feedstock for polymers has led to poor thermomech. properties with high production costs. Herein, the production of novel chiral dicarboxylic acids derived from renewable itaconic and amino acids (D- or L-leucine) is reported. In this study, rigid chiral heterocyclic dicarboxylic acid monomers are obtained with high purity from itaconic acid-derived di-Me itaconate as a starting material. Chirally interactive polyamides are prepared via melt polycondensation of hexamethylenediamine with heterocyclic diacid monomers. Further studies are conducted on D- or L-leucine-derived polyamides with homochirality that are fully amorphous. In contrast, the crystallization degree of the composite of D-leucine-derived polymer chains with L-leucine-derived chains increases to 36%, presumably due to enhanced interaction between polymer chains with different chiralities. The chirally-interacting composite shows a glass transition temperature, T_g, of approx. 117°C and a melting temperature, T_m, of approx. 213°C, which are higher than those of conventional polyamides such as polyamide 11 (T_g of approx. 57°C). The composite also shows high Young’s moduli, E, and mech. strengths σ, ranging from 2.2-3.8 GPa and 86-108 MPa, resp. In addition, the polyamides show degradability with a digestive enzyme, pepsin.

Advanced Sustainable Systems 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, SDS of cas: 617-52-7.

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

Ushigoe, Yoshihiro published the artcileSynthesis of 1,2,4-trioxanes and 1,2,4-trioxepanes by N-halogenosuccinimide-mediated cyclizations of unsaturated hydroperoxyacetals, COA of Formula: C12H14O2, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1997), 5-10, database is CAplus.

Ozonolyses of vinyl ethers R¹R²C:CHOMe [R¹ = Ph, C₇H₁₅, R² = H; R¹R² = (CH₂)₅] in CH₂Cl₂ in the presence of allylic and homoallylic alcs. R⁴₂C:CR³CH₂OH (R³ = Me, H, R⁴ = H, Me) and H₂C:CMeCH₂CH₂OH give in each case the corresponding unsaturated hydroperoxy acetals R⁴₂C:CR³CH₂OCR¹R²OOH and H₂C:CMeCH₂CH₂OCR¹R²OOH, derived from capture of the carbonyl oxides by the unsaturated alcs. N-Halosuccinimide-mediated cyclizations of the hydroperoxides give the corresponding 1,2,4-trioxanes, e.g., I and/or 1,2,4-trioxepanes, e.g., II (X = Br, iodo), depending on the structure of the hydroperoxides and the identity of the N-halosuccinimides.

Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic 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 C17H14N2O2, COA of Formula: C12H14O2.

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

Krause, Frederick C. published the artcileScreening electrolytes designed for high voltage electrochemical capacitors, Recommanded Product: Ethyl (2,2,2-trifluoroethyl) carbonate, the publication is Electrochimica Acta (2021), 137898, database is CAplus.

Standard acetonitrile/tetraalkylammonium-tetrafluoroborate-based electrochem. capacitor electrolytes were modified with both fluorinated additives (including fluorinated analogs of ethylmethyl carbonate and di-Et carbonate, lithium difluoro(oxalato)borate, and tris(2,2,2-trifluoroethyl) phosphite) and spiro(1,1′)-bipyrrolidinium tetrafluoroborate salt, to improve stability at higher voltages (>2.7 V). Compounds investigated included (2,2,2-trifluoroethyl) Me carbonate (TFEMC), ethyl(2,2,2-trifluoroethyl) carbonate (ETFEC), bis(2,2,2-trifluoroethyl) carbonate (bTFEC), lithium difluoro(oxalato)borate (LiDFOB), and tris(2,2,2-trifluoroethyl) phosphite (TTFEPi). Screening of modified electrolytes in prototype coin cells using constant current cycling and voltage hold test protocols revealed good retention of capacitance and a reduced cell internal resistance growth when operating at maximum voltages between 3.5 and 4.0 V. These results suggest new strategies for increasing the operating limits of elec. double-layer type supercapacitors, to increase stored energy and improve their compatibility with lithium-ion battery cells for use in hybrid configurations.

Electrochimica Acta published new progress about 156783-96-9. 156783-96-9 belongs to esters-buliding-blocks, auxiliary class Trifluoromethylated Building Blocks, name is Ethyl (2,2,2-trifluoroethyl) carbonate, and the molecular formula is C5H7F3O3, Recommanded Product: Ethyl (2,2,2-trifluoroethyl) carbonate.

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

Lutter, Ferdinand H. published the artcileFacile Conversion of Molecularly Complex (Hetero)aryl Carboxylic Acids into Alkynes for Accelerated SAR Exploration, Category: esters-buliding-blocks, the publication is Chemistry – A European Journal (2021), 27(60), 14816-14820, database is CAplus and MEDLINE.

Herein, a functional-group-tolerant and operationally simple decarbonylative alkynylation that allows the conversion of complex (hetero)aryl carboxylic acids into alkynes were reported. Furthermore, the utility of this method was demonstrated in the preparation of a triazolo analog of the com. drug moclobemide. Lastly, mechanistic investigations using labeled carboxylic acid derivatives clearly show the decarbonylative nature of this transformation.

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, Category: esters-buliding-blocks.

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

Badet, B. published the artcileEffect of copper salts on the alkylation of carboxylate ions by sulfonium salts, Name: 3-Methylbut-2-en-1-yl benzoate, the publication is Tetrahedron (1983), 39(19), 3111-25, database is CAplus.

BzOK, AcOK, and BzOH-K₂CO₃ were alkylated using sulfonium salts Ph₂S⁺R, PhS⁺R¹R², R³S⁺R⁴₂, or R⁵R⁶S⁺CH₂CH:CH₂ [R = Me, Et, Pr, Bu, allyl, CHMe₂, CH₂Ph; R¹, R⁶ = lauryl, Me; R² = allyl, lauryl; R³ = Me, Pr, CHMe₂, CMe₃, allyl, methallyl, 2-octyl, prenyl, lauryl; R⁴ = Me, Pr, allyl, lauryl, (CH₂)_4,5; R⁵ = Et, Ph]. Mixtures of esters were obtained. In the presence of Cu(I) salts, the reaction of allylic sulfonium salts became very selective in favor of the unsaturated residues. Prenyl sulfonium salts, which reacted through the α-position in the absence of Cu salts, gave exclusively tertiary esters when a catalytic amount of CuBr was present.

Tetrahedron 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, Name: 3-Methylbut-2-en-1-yl benzoate.

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

Gauchet, F. published the artcileRegiochemistry of alkylation of benzoate and hydrogen dibenzoate anions with 1,1-dimethylallyl and 3,3-dimethylallyldimethylsulfonium salts. Influence of copper(I), Recommanded Product: 3-Methylbut-2-en-1-yl benzoate, the publication is Bulletin de la Societe Chimique de France (1990), 268-74, database is CAplus.

CH₂:CHCMe₂S⁺Me₂ BF₄^– (I) was prepared by methylation of CH₂:CHCMe₂SMe, to compare its reactivity towards substitution to that of Me₂C:CHCH₂S⁺Me₂ BF₄^– (II). Substitution by benzoate is remarkably sensitive to the nature of the nucleophile: whereas, the reaction of PhCO₂K with I gives a 50:50 mixture of primary and tertiary esters, potassium hydrogen dibenzoate leads exclusively to the tertiary ester. In the presence of copper(I) the tertiary benzoate is the only product obtained with both nucleophiles, as in the case of II; this result is consistent with the involvement of a π-allyl copper intermediate common to both isomers.

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, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate.

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