Esters-buliding-blocks

Kirihara, Masayuki published the artcileAerobic Photooxidation of Toluene Derivatives into Carboxylic Acids with Bromine-Water under Catalyst-Free Conditions, Formula: C9H8O4, the publication is Synlett, database is CAplus.

The photoirradiation of toluene derivatives with two equivalent of bromine in benzotrifluoride-water provided a satisfactory yield of the corresponding benzoic acid derivatives Either a fluorescent lamp, blue LED (454 nm), or UV LED (385 nm) was used for the photoreaction. The reaction pathway might proceed through the dibromination of benzylic carbon, generation of the benzylic radical via oxidative C-H abstraction, formation of benzoyl bromide, and hydrolysis of carboxylic acid.

Synlett 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, Formula: C9H8O4.

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

Kunitake, Toyoki published the artcileCatalytic hydrolysis of dinitrophenyl sulfate by polyethylenimine derivatives, Category: esters-buliding-blocks, the publication is Bulletin of the Chemical Society of Japan (1979), 52(8), 2402-8, database is CAplus.

The catalytic hydrolysis of nitrophenyl sulfates by poly(ethylenimine) (PEI) derivatives was investigated at 30° in aqueous buffers. The catalytic hydrolysis of 2-hydroxy-5-nitrophenyl sulfate by an PEI with imidazolylmethyl and dodecyl substituents failed to proceed in spite of the contrary report by Kiefer et al. 2,4-Dinitrophenyl sulfate was cleaved fairly readily by PEI derivatives Simple sulfate transfer was observed in the case of alkylated PEI, but the catalytic hydrolysis proceeded according to the Michaelis-Menten kinetics in the case of quaternized PEI. Partly quaternized PEI’s showed highest catalytic efficiencies reported to date for the hydrolysis of dinitrophenyl sulfate. Nitrophenyl sulfates were not cleaved by these polymers.

Bulletin of the Chemical Society of Japan 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, Category: esters-buliding-blocks.

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

Joseph, Jayan T. published the artcileRoom Temperature Carbonylation of (Hetero) Aryl Pentafluorobenzenesulfonates and Triflates using Palladium-Cobalt Bimetallic Catalyst: Dual Role of Cobalt Carbonyl, Recommanded Product: 3-(Methoxycarbonyl)benzoic acid, the publication is Advanced Synthesis & Catalysis (2017), 359(3), 419-425, database is CAplus.

An efficient method for the carbonylation of (hetero) aryl pentafluorobenzenesulfonates and triflates under exceptionally mild conditions using palladium/dicobalt octacarbonyl [Pd/Co₂(CO)₈] has been developed. Besides acting as carbon monoxide (CO) source, Co₂(CO)₈ enhances the reaction rate by accelerating the CO insertion through an in situ generated bimetallic palladium cobalt tetracarbonyl [Pd-Co(CO)₄] complex. Under the optimized reaction condition, carbonylation of a wide range of activated and deactivated, as well as sterically hindered and heteroaromatic, substrates proceeded efficiently at room temperature The high chemoselectivity and improved synthesis of biol. relevant Isoguvacine and Lazabemide intermediates highlights its scope as a valuable synthetic method. The generality of this protocol was further extended to other electrophiles (bromides, chlorides and tosylates).

Advanced Synthesis & Catalysis 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, Recommanded Product: 3-(Methoxycarbonyl)benzoic acid.

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

Munoz-Pascual, Santiago published the artcileEffect on the Impact Properties of Adding Long-Chain Branched Polypropylene in Polypropylene-Polyolefin Elastomer Cellular Polymers Produced by Core-Back Injection Molding, Product Details of C42H63O3P, the publication is Macromolecular Materials and Engineering (2021), 306(4), 2000728, database is CAplus.

Different blends of a linear polypropylene (L-PP), a long-chain branched polypropylene (LCB-PP), and a polyolefin elastomer (POE) are prepared and foamed using core-back injection molding. The objective is to analyze the use of POE and LCB-PP as complementary strategies to improve cellular polymers’ impact response. Different parameters are then studied in blends and injection molded plaques to understand the samples’ mech. behavior. Parameters such as the interfacial tension, elastomer morphol., extensional rheol., cellular structure, and crystallization behavior are characterized in detail. The addition of POE allows improving the impact response of both the solids and cellular polymers, but the stiffness is reduced. On the other hand, the substitution of L-PP by LCB-PP, in blends containing POE, results in solids and cellular materials with both better stiffness and better impact properties, due to the different crystalline morphol. comprising the samples, a different cellular orientation, and thicker solid skin.

Macromolecular Materials and Engineering 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

Munoz-Pascual, Santiago published the artcileEffect of the elastomer viscosity on the morphology and impact behavior of injection molded foams based on blends of polypropylene and polyolefin elastomers, HPLC of Formula: 31570-04-4, the publication is Journal of Applied Polymer Science (2021), 138(20), 50425, database is CAplus.

The impact resistance of injection-molded polypropylene (PP) parts is severely reduced when they are foamed. It is necessary to implement strategies, such as elastomer toughening, to increase the impact behavior of foamed parts. However, the knowledge on the effect of elastomer addition on the morphol., cellular structure, and impact of injection-molded cellular parts is very limited. In this work, foamed parts based on blends of PP and polyolefin elastomers have been produced and characterized. A high and a low viscosity octene-ethylene copolymer (EOC) and a high viscosity butene-ethylene copolymer (EBC) were employed. The blends have been thermally and rheol. characterized. Solids materials and foams (relative d. 0.76) were injection-molded. The solid phase and cellular structure morphologies were studied using SEM. The results showed that elastomer toughening has been successful to obtain an improvement of the impact behavior in solid and cellular polymers. In this case, EOC materials provide an appropriate interfacial adhesion and optimized cellular structure which results in high impact resistance. The optimum elastomer to improve the properties is the EOC with a higher viscosity which provides impact resistance with n values below 3 due to the toughening of polymer matrix, thick skin thickness, and low cell size.

Journal of Applied Polymer Science 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, HPLC of Formula: 31570-04-4.

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

Nobsathian, Saksit published the artcileThe insecticidal potential of Piper ribesioides (Piperales: Piperaceae) extracts and isolated allelochemicals and their impact on the detoxification enzymes of Spodoptera exigua (Lepidoptera: Noctuidae), Synthetic Route of 103-26-4, the publication is Phytoparasitica (2021), 49(4), 659-673, database is CAplus.

The dried twigs of Piper ribesioides were used to prepare various extracts in different solvents. Each extract was evaluated for their toxicity against 2nd instar larvae of Spodoptera exigua. The highest acute toxicity was observed for Et acetate extract with an LD50 of 3.25 and 2.50 μg/larva and LD90 of 9.19 and 8.15 μg/larva after 24 and 48 h post-treatment after topical application. Piperine, Me piperate, N-cinnamoyl-(2-phenylethyl) amine, pinostrobin, pinocembrin, cinnamic acid, lemairamin, N,N-Diphenylcinnamide, and Me cinnamate were isolated from this extract that was toxic to S. exigua larvae. Cinnamic acid was the most active compound with a LD50 of 0.17 μg/larva after 48 h of topical treatment. Piperine was significantly similar in activity (LD50 = 0.19 μg/larva), but toxicity decreased with the change in structural configuration as observed with Me piperate (LD50 = 0.73 μg/larva). Other compounds were 3 to 11-fold less toxic than cinnamic acid and piperine. Growth of survived S. exigua larvae until adult emergence after topical application was recorded and maximum inhibition of about 70% was observed after the application of cinnamic acid. Egg hatch was only 29.11% after cinnamic acid treatment, compared to 97.38% in controls. Neither induction nor inhibition of detoxification enzymes due to treatment of extracts were statistically significant, however, individual compounds like cinnamic acid, Me cinnamate, piperine, pinostrobin, pinocembrin, and lemairamin did show a moderate impact on these enzymes.

Phytoparasitica 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, Synthetic Route of 103-26-4.

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

Takahashi, Shinya published the artcileSynthesis of amphiphilic copolymers having capability as emulsifiers and their surface chemical properties, Application In Synthesis of 3052-61-7, the publication is Journal of Adhesion (2003), 79(3), 287-309, database is CAplus.

Some comblike terpolymers composed of Me methacrylate (MMA), methoxypolyethyleneglycol methacrylate (MPEGMA) as a hydrophilic component, and methoxypolypropyleneglycol methacrylate (MPPGMA) as a hydrophobic component were synthesized by both living radical photopolymerization and ordinary radical polymerization Since these terpolymers showed a high surface activity, it was suggested that they could be utilized as good polymeric emulsifiers. The polymeric emulsions containing these emulsifiers also showed comparatively good emulsion and mech. properties as an adhesive. From these facts, it was found that these terpolymers had almost the same emulsification capability as com. available low mol. weight emulsifiers. Conversely, a difference in surface tension behavior of these terpolymers could be observed It was due to the chain arrangements (random or block sequence) of the terpolymer.

Journal of Adhesion 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 C38H74Cl2N2O4, Application In Synthesis of 3052-61-7.

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

Julia, Marc published the artcileOxidation of carbanions with lithium tert-butyl peroxide, Name: Ethyltert-butylacetate, the publication is Synlett (1993), 233-4, database is CAplus.

Lithium tert-Bu peroxide reacts with several carbanions, leading to the corresponding alcs. via oxygen transfer. Lithiated arenes can be converted into phenols. An easy and convenient preparation of ynolates opening the way to ketenes, esters or silyl ynol ethers from acetylides is reported. Lithiated hydroperoxides display an electrophilic behavior at oxygen that can be compared with the electrophilic properties of carbenoids.

Synlett published new progress about 5340-78-3. 5340-78-3 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is Ethyltert-butylacetate, and the molecular formula is C8H16O2, Name: Ethyltert-butylacetate.

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

Ledauphin, Jerome published the artcileIdentification of Trace Volatile Compounds in Freshly Distilled Calvados and Cognac Using Preparative Separations Coupled with Gas Chromatography-Mass Spectrometry, Recommanded Product: Isobutyl palmitate, the publication is Journal of Agricultural and Food Chemistry (2004), 52(16), 5124-5134, database is CAplus and MEDLINE.

GC-MS using both electron impact and chem. ionization detection modes led to the determination of the volatile composition of 2 samples of freshly distilled Cognac and 2 samples of freshly distilled Calvados. A total of 169 volatile compounds were directly identified in dichloromethane extracts obtained by liquid-liquid extraction Trace compounds present in both spirits were characterized with the help of preparative separations In a 1st step, groups of compounds were separated by preparative GC, and the fractions were analyzed on a polar stationary phase by GC-MS. In a 2nd step, silica gel fractionation was used to sep. them by polarity. In 331 compounds, of which 162 can be considered as trace compounds, were characterized in both freshly distilled Cognac and Calvados. Of these, 39 are common to both spirits; 30 are specific to Cognac with numerous hexenyl esters and norisoprenoidic derivatives, whereas 93 are specific to Calvados with compounds such as unsaturated alcs., phenolic derivatives, and unsaturated aldehydes.

Journal of Agricultural and Food Chemistry 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, Recommanded Product: Isobutyl palmitate.

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

Thornbury, Richard T. published the artcileThe development and mechanistic investigation of a palladium-catalyzed 1,3-arylfluorination of chromenes, Quality Control of 1877-71-0, the publication is Chemical Science (2017), 8(4), 2890-2897, database is CAplus and MEDLINE.

A mild palladium-catalyzed ligand-controlled regioselective 1,3-arylfluorination of 2[H]-chromenes was developed. The products with a syn-1,3 substitution pattern were obtained with high enantiomeric excess using a PyrOx ligand, wherein the utility of these pyranyl-fluorides was further demonstrated through their participation in a diastereoselective C-C bond forming reaction. Ligand dependent divergent formation of both the 1,3- and 1,2- alkene difunctionalization products was observed The nature of this bifurcation was investigated through exptl. studies in combination with computational and statistical anal. tools. Ultimately, the site selectivity was found to rely on ligand denticity and metal electrophilicity, the electronics of the boronic acid, and the donor ability of the directing group in the substrate.

Chemical Science 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 C65H82N2O18S2, Quality Control of 1877-71-0.

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