Month: December 2022

Annibaletto, Julien published the artcileAmmonium Salts as Convenient Radical Precursors using Iridium Photoredox Catalysis, Category: esters-buliding-blocks, the publication is Organic Letters (2022), 24(23), 4170-4175, database is CAplus and MEDLINE.

Ammonium salts are usually considered as highly challenging to reduce into the corresponding radicals because of the strength of their carbon-nitrogen bond. Here, authors disclose that several ammonium salts can be readily activated using iridium photoredox catalysis to form radicals and illustrate the synthetic utility of this activation of strong C-N bonds with hydrodeamination reactions and radical couplings. Cyclic voltammetry was exploited to rationalize the reactivity observed for the activation of these ammonium salts.

Organic Letters 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, Category: esters-buliding-blocks.

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

Vijayakumar, B. published the artcileAn eco-friendly method for the synthesis of aryl and alkyl esters of carboxylic acids using acid activated Indian bentonite, Application of Isobutyl palmitate, the publication is Journal of the Indian Chemical Society (2005), 82(10), 922-925, database is CAplus.

Esterification of various carboxylic acids with phenol and alcs. was achieved using acid activated Indian bentonite (AAIB) as catalyst. The catalyst is versatile, and the reaction is found to work well for primary, secondary and tertiary alcs. The yields are very good under specific reaction conditions.

Journal of the Indian Chemical Society 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 C5H10OS, Application of Isobutyl palmitate.

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

Kovsman, E. P. published the artcileAnodic condensation of mixtures of dicarboxylic acid monomethyl esters in methyl alcohol, Synthetic Route of 5205-11-8, the publication is Neftekhimiya (1965), 5(5), 730-7, database is CAplus.

Using the gas-liquid chromatographic method, electrolytic condensation of monomethyl esters of succinic, glutaric, and adipic acids has been investigated during their electrolysis on a Pt electrode (anode) in MeOH solutions The monomethyl ester of succinic acid + the monomethyl ester of glutaric acid give dimethyl esters of adipic, pimelic, and suberic acids by anodic condensation; the monomethyl ester of succinic acid + the monomethyl ester of adipic acid give the dimethyl esters of adipic, suberic, and sebacic acids; the monomethyl ester of glutaric acid + the monomethyl ester of adipic acid give dimethyl esters of suberic, azelaic, and sebacic acids. Optimum conditions for this process were determined (c.d. 10-20 amp./dm.¹, temperature 60°) and some relations of the formation of even products of anodic condensation were found in their dependence on the composition of the electrolyte. 17 references.

Neftekhimiya 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, Synthetic Route of 5205-11-8.

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

Golubeva, M. V. published the artcileInitiated oxidation of alkylaromatic hydrocarbons in the presence of dialkyldithiocarbamic acid esters, HPLC of Formula: 3052-61-7, the publication is Zhurnal Obshchei Khimii (1996), 66(1), 137-140, database is CAplus.

Liquid-phase oxidation kinetics of cumene and ethylbenzene was studied in the presence of the title model antioxidants R₂NCS₂R’ [e.g., 2,4,6-tris(dibutyldithiocarbamoyl)-1,3,5-triazine]. During the oxidation, formation of an equilibrium self-replicating system hydrocarbon-hydroperoxide-antioxidant-phenol was observed The system has a prolonged antioxidant effect due to continuous generation of phenol – the radical acceptor.

Zhurnal Obshchei Khimii 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 C12H17NS2, HPLC of Formula: 3052-61-7.

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

Mehravar, Ehsan published the artcilePhase behavior of side-chain liquid-crystalline polymers containing biphenyl mesogens with different spacer lengths synthesized via miniemulsion polymerization, Safety of Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Polymer Chemistry (2016), 7(29), 4736-4750, database is CAplus.

The synthesis of a series of methacrylate side-chain liquid crystal polymers (SCLCPs) bearing biphenyl mesogen with different spacer lengths and a fixed tail, poly[ethyl 4′-((n-(methacryloyloxy)alkyl)oxy)-[1,1′-biphenyl]-4-carboxylate]s (n-PMLCM, n = 3, 4, 5, 6), in aqueous media by free radical miniemulsion polymerization is described. This method offers the advantage of producing high molar masses (>10⁵ Da) and full monomer conversion, not possible to achieve with conventional routes (solution polymerization). The resulting n-PMLCMs proved to have high thermal stability. The phase behaviors of the polymers were investigated by a combination of techniques including differential scanning calorimetry, polarized light microscopy, and small and wide angle X-ray scattering. The results show mesomorphic liquid crystalline behavior with a monolayer structure where the side-groups on both sides of the backbone would be interpenetrated. The liquid crystal phase transition of n-PMLCM follows the sequence smectic E (smectic E or smectic C for 4-PMLCM) ↔ smectic A ↔ isotropic liquid The transition temperatures and the associated entropy changes exhibit a distinct odd-even effect as the length and parity of the spacer are varied, with the odd members exhibiting the higher values. The high molar masses achievable using miniemulsion polymerization translate into a more perfect and stable ordering, characterized by larger lamellar domains and higher transition temperatures, than in low molar mass SCLCPs. Compared to polymeric liquid crystals with similar mesogens but shorter tails, we found that longer tails facilitate the ordering of the mesogens and allow more efficient packing around the backbones, imparting a high stability to the smectic phases formed.

Polymer Chemistry 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, Safety of Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

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

Chary Devulapally, Yogananda published the artcileRhodium(III)-Catalyzed Dehydrogenative Annulation of 2-Arylindazoles with Cyclic Enones, SDS of cas: 103-26-4, the publication is European Journal of Organic Chemistry (2021), 2021(21), 3083-3090, database is CAplus.

An oxidative annulation of 2-arylindazoles with cyclic enones has was developed using Rh(III)/Cu(OAc)₂ catalytic system for the first time to produce 3,4-dihydroindazolo[2,3-f]phenanthridin-1(2H)-one derivatives in good yields with high selectivity. When AgSbF₆ was used instead of Cu(OAc)₂, the corresponding uncyclized products, 3-(2-(2H-indazol-2-yl)phenyl)cyclohexan-1-one scaffolds were formed exclusively. The reaction proceeds through a sequential conjugate addition of ortho-C-H bond of aryl group followed by an oxidative annulation of indazole ring to generate fused polycyclic scaffolds.

European Journal of Organic Chemistry 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, SDS of cas: 103-26-4.

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

Ullah, Mohammad Shahid published the artcileCinchona Squaramide-Based Chiral Polymers as Highly Efficient Catalysts in Asymmetric Michael Addition Reaction, Related Products of esters-buliding-blocks, the publication is ACS Omega (2018), 3(4), 4573-4582, database is CAplus and MEDLINE.

We have synthesized novel chiral polymers containing a cinchona-based squaramide in the main chain. We designed a novel cinchona squaramide dimer that contains two cinchona squaramide units connected by diamines. The olefinic double bonds in the cinchona squaramide dimer were used for Mizoroki-Heck (MH) polymerization with aromatic diiodides. The MH polymerization of the cinchona squaramide dimer and aromatic diiodide proceeded well to give the corresponding chiral polymers in good yields. The catalytic activity of the chiral polymers was investigated for asym. Michael addition reactions. The effect of the squaramide structure of the polymeric catalyst on the catalytic performance is discussed in detail. We have surveyed the influence of the chiral polymer structure on the catalytic activity and enantioselectivity of the asym. reaction. The asym. Michael addition of β-ketoesters to nitroolefins was successfully catalyzed by polymeric cinchona squaramide organocatalysts to obtain the corresponding Michael adducts in good yields with excellent enantio- and diastereoselectivities. The polymeric catalysts were insoluble in commonly used organic solvents and easily recovered from the reaction mixture and reused several times without the loss of catalytic activity.

ACS Omega published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C15H15OP, Related Products of esters-buliding-blocks.

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

Ishida, Hideharu published the artcileSynthetic studies on sialoglycoconjugates. 94. Synthesis of 6′-GM2, a regioisomer of ganglioside GM2, for studying the mechanism of action of GM2 activator, HPLC of Formula: 10378-06-0, the publication is Carbohydrate Research (1997), 302(3-4), 223-227, database is CAplus and MEDLINE.

GM2 activator is a protein cofactor that assists β-hexosaminidase (HexA) in hydrolyzing the β-linked N-acetylgalactosamine (GalNAc) in ganglioside GM2. We report a synthesis of the regioisomer of ganglioside GM2, 6′-GM2, in which the GalNAc residue is linked, not to the 4-OH, but to the 6-OH of Gal to show that the resistance of GalNAc in GM2 to HexA is due to the specific structure of the GM2-epitope, β-D-GalNAc-(1→4)-α-Neu5Ac-(2→3)-β-D-Gal→.

Carbohydrate Research published new progress about 10378-06-0. 10378-06-0 belongs to esters-buliding-blocks, auxiliary class Other Aliphatic Heterocyclic,Chiral,Ester,Inhibitor,Inhibitor, name is (3aR,5R,6R,7R,7aR)-5-(Acetoxymethyl)-2-methyl-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]oxazole-6,7-diyl diacetate, and the molecular formula is C14H19NO8, HPLC of Formula: 10378-06-0.

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

Conway, Walter D. published the artcileSolvent selection for countercurrent chromatography by rapid estimation of partition coefficients and application to polar conjugates of p-nitrophenol, Computed Properties of 6217-68-1, the publication is Journal of Liquid Chromatography (1984), 7(2), 275-89, database is CAplus.

A rapid and moderately precise technique to measure partition coefficients of UV-absorbing solutes in solvent systems for countercurrent chromatog. is described and applied to p-nitrophenol and its conjugates with glucose, H₂SO₄ and glucuronic acid. It involves equilibration of 1 mL of each phase with solute in a narrow test tube, removal of the entire lower phase, dilution with MeOH and calculation of the partition coefficient as the ratio of the absorbance values of each dilution at any suitable wavelength. The polar conjugates of p-nitrophenol can be separated by countercurrent chromatog. by using EtOAc as mobile phase and aqueous KH₂PO₄ as stationary phase.

Journal of Liquid Chromatography published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C6H4KNO6S, Computed Properties of 6217-68-1.

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

Takaya, Jun published the artcileFluorine-controlled C-H borylation of arenes catalyzed by a PSiN-pincer platinum complex, COA of Formula: C14H18BFO4, the publication is Chemical Communications (Cambridge, United Kingdom) (2015), 51(100), 17662-17665, database is CAplus and MEDLINE.

An efficient, regioselective synthesis of fluorine-substituted arylboronic esters was achieved through fluorine-controlled C-H borylation of arenes with diboron catalyzed by a PSiN-platinum complex. The promising utility of the PSiN-platinum catalyst and its unique regioselectivity were demonstrated for the first time, which would complement the well-developed Ir-catalyzed C-H borylation.

Chemical Communications (Cambridge, United Kingdom) published new progress about 757982-31-3. 757982-31-3 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester,Boronic acid and ester, name is Methyl 4-fluoro-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate, and the molecular formula is C34H33ClN6O7, COA of Formula: C14H18BFO4.

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