Tag: 200-300

N-Iodosuccinimide-promoted Regioselective Selenylation of 4H-Pyrido-[1,2-a]-pyrimidin-4-ones with Diselenides at Room Temperature was written by Guo, Lina;Su, Meiyun;Lv, Junliang;Liu, Wenjie;Wang, Shaohua. And the article was included in Asian Journal of Organic Chemistry in 2021.Application In Synthesis of Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:

A novel and efficient approach for the regioselective selenylation of 4H-pyrido-[1,2-a]-pyrimidin-4-ones with diselenides at room temperature was developed. This procedure was catalyzed by N-iodosuccinimide under metal-free conditions with a broad range of substrate scopes and affords C3 selenylation products in good to excellent yields. Furthermore, the sulfenylation with di-Ph disulfides and 4-methylbenzenethiol in this transformation was successful. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Application In Synthesis of Ethyl 3-oxo-3-(m-tolyl)propanoate).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Application In Synthesis of Ethyl 3-oxo-3-(m-tolyl)propanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Renewable Polyethers via GaBr₃-Catalyzed Reduction of Polyesters was written by Dannecker, Patrick-Kurt;Biermann, Ursula;von Czapiewski, Marc;Metzger, Juergen O.;Meier, Michael A. R.. And the article was included in Angewandte Chemie, International Edition in 2018.Quality Control of Dimethyl decanedioate This article mentions the following:

Herein, a novel approach is reported for the synthesis of medium- and long-chain aliphatic polyethers 2 based on the GaBr₃-catalyzed reduction of polyesters 1 with TMDS as the reducing agent. Thus, various linear and branched aliphatic polyesters 1 were prepared and systematically investigated for this reduction strategy, demonstrating the applicability and versatility of this new polyether synthesis protocol. Medium- and long-chain chain polyethers were obtained from the resp. polyesters without or with minor chain degradation, whereas short-chain polyesters, such as poly-L-lactide 1 i and poly[(R)-3-hydroxybutanoate] 1 j, showed major chain degradation In this way, previously unavailable and uncommon polyethers were obtained and studied. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Quality Control of Dimethyl decanedioate).

Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Quality Control of Dimethyl decanedioate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Probing the RAFT Process Using a Model Reaction between Alkoxyamine and Dithioester was written by Li, Changxi;He, Junpo;Liu, Ying;Zhou, Yanwu;Yang, Yuliang. And the article was included in Australian Journal of Chemistry in 2012.Product Details of 27249-90-7 This article mentions the following:

A small-mol. model reaction was designed to probe the reversible addition-fragmentation chain transfer (RAFT) process. In this reaction, alkoxyamine releases radicals that react in situ with dithioester through the RAFT process, generating new radicals through the fragmentation of the intermediate radical. The new radicals can be trapped by free 2,2,6,6-tetramethyl-piperidinyl-N-oxyl radicals (TEMPO) from homolysis of alkoxyamine. The overall reaction is the crossover of the leaving groups between alkoxyamine and dithioester. The advantage of this model as a probe of the RAFT process is that it does not involve polymerization-related elementary reactions such as initiation, propagation, and chain length dependent termination. The kinetics of the model reaction were measured using high-performance liquid chromatog., and then fitted by Monte Carlo simulation to estimate rate coefficients The obtained rate coefficients of addition for various dithioesters fell into a narrow range of 107-10⁸Lmol^-1s^-1, whereas the rate coefficient of fragmentation was model-dependent. It was also found that a significant fraction of the dithioester was consumed by an unspecified addnl. mechanism. A tentative explanation is proposed in which the intermediate radical undergoes a secondary RAFT reaction with dithioesters, forming a secondary intermediate that serves as a radical reservoir. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Product Details of 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Product Details of 27249-90-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Cationic methacrylate polymers containing chiral amino acid moieties: controlled synthesis via RAFT polymerization was written by Kumar, Sonu;Roy, Saswati Ghosh;De, Priyadarsi. And the article was included in Polymer Chemistry in 2012.Safety of Benzyl benzodithioate This article mentions the following:

Two methacrylate containing amino acid based chiral monomers, Boc-L-alanine methacryloyloxyethyl ester (Boc-Ala-HEMA) and Boc-L-phenylalanine methacryloyloxyethyl ester (Boc-Phe-HEMA), were polymerized by the reversible addition-fragmentation chain transfer (RAFT) process to afford well-defined amino acid based polymers with controlled mol. weight, narrow mol. weight distribution, and precise chain end structure. Linear pseudo-first-order kinetics and number average mol. weight dependence on conversion were observed for the RAFT polymerizations Di-block copolymers were prepared by RAFT polymerization of Me methacrylate using poly(Boc-L-alanine methacryloyloxyethyl ester) or poly(Boc-L-phenylalanine methacryloyloxyethyl ester) as macro-chain transfer agents. Subsequent deprotection of the Boc group produced architectures with a primary amine moiety at the side chain, which showed pH responsiveness. The sp. rotations of both the chiral monomers and corresponding homo- and block copolymers were studied and alteration of sp. rotation due to transformation of monomer to polymer was noticed. In addition, the surface charge of various polymeric architectures was studied using dynamic light scattering (DLS) measurements. The self-assembly of block copolymer films was investigated by at. force microscopy (AFM). These pH-responsive cationic polymers can potentially be extended for the delivery of small interfering RNA. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Safety of Benzyl benzodithioate).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Safety of Benzyl benzodithioate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Efficient Synthesis of Dissymmetric Malonic Acid S,O-Esters via Monoalcoholysis of Symmetric Dithiomalonates under Neutral Conditions was written by Matsuo, Kazumasa;Shindo, Mitsuru. And the article was included in Organic Letters in 2011.Recommanded Product: 1190-39-2 This article mentions the following:

A novel method for the highly selective synthesis of dissym. S,O-malonates starting from sym. di-Ph dithiomalonates under neutral conditions is described. The key step is the thermal formation of an acylketene, the stability of which would contribute to the selectivity. The synthetic utility of the dissym. S,O-malonates is also shown. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Recommanded Product: 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Recommanded Product: 1190-39-2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Reversible addition-fragmentation chain transfer polymerization of a typical hydrophobic monomer of styrene within microreactor of shell-corona hollow microspheres suspending in water was written by Zhang, Minchao;Zhang, Wangqing. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2010.Related Products of 27249-90-7 This article mentions the following:

Reversible addition-fragmentation chain transfer (RAFT) polymerization of a typical hydrophobic monomer of styrene within microreactor of shell-corona hollow microspheres of poly(styrene-co-methacrylic acid) suspending in water is studied. The shell-corona hollow microspheres contain a hydrophilic corona of poly(methacrylic acid) (PMAA) and a crosslinked polystyrene shell, which can suspend in water because of the hydrophilic corona of PMAA. The size of the shell-corona hollow microspheres is about 289 nm and the extent of the microcavity of the hollow microsphere is 154 nm. These shell-corona hollow microspheres can act as microreactor, within which the typical hydrophobic monomer of styrene, the RAFT agent of S-benzyl dithiobenzoate and the initiator of 2,2′-azobisisobutyronitrile can be encapsulated and RAFT polymerization of styrene takes place in well controlled manner in water. It is found that the resultant polymer of polystyrene has a competitively low polydispersity index and its number-average mol. weight linearly increases with monomer conversion. The method is believed to be a new strategy of RAFT polymerization of hydrophobic monomer in aqueous solution © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Related Products of 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Related Products of 27249-90-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Facile Synthesis of Intelligent Polymers Modified Gold Nanoparticles in Aqueous Solution was written by Zhai, Cuiping;Liu, Xuejun;Chen, Xia;Li, Lina;Sun, Fang;Ma, Huiting. And the article was included in Journal of Inorganic and Organometallic Polymers and Materials in 2015.SDS of cas: 27249-90-7 This article mentions the following:

This paper describes the synthesis of gold nanoparticles (GNPs) stabilized with intelligent poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA). First, the dithioester-terminated PDMAEMA was prepared by the reversible addition-fragmentation chain transfer technique. Then, the dithioester-terminated PDMAEMA was reduced to a thiol-terminated polymer PDMAEMA-SH. PDMAEMA coated GNPs (Au@PDMAEMA NPs) were synthesized in situ from HAuCl₄ aqueous solution by using NaBH₄ as a reductant and thiolated PDMAEMA as a stabilizer through Au-S bond. The optical and phys. properties of GNPs were characterized by UV-visible spectroscopy, transmission electron microscopy, x-ray diffraction as well as thermogravimetric anal. The size and shape of GNPs could be controlled by tuning both the [PDMAEMA]:[HAuCl₄] molar ratio and the solution pH. It is believed that these highly biocompatible GNPs have potential biomedical applications. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7SDS of cas: 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.SDS of cas: 27249-90-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dual-stimuli-responsive porous polymer enzyme reactor for tuning enzymolysis efficiency was written by Shen, Ji;Qiao, Juan;Zhang, Xinya;Qi, Li. And the article was included in Microchimica Acta in 2021.Application of 27249-90-7 This article mentions the following:

A strategy for preparing a dual-stimuli-responsive porous polymer membrane enzyme reactor (D-PPMER) is described, consisting of poly(styrene-maleic anhydride-N-isopropylacrylamide-acrylate-3′,3′-dimethyl-6-nitro-spiro[2H-1-benzopyran-2,2′-indoline]-1′-esterspiropyran ester) [P(S-M-N-SP)] and D-amino acid oxidase. Tunable control via “on/off” 365 nm UV light irradiation and temperature variation was used to change the membrane surface configuration and adjust the enzymolysis efficiency of the D-PPMER. A chiral capillary electrophoresis technique was developed for evaluation of the enzymic efficiency of D-PPMER with a Zn(II)-dipeptide complex as the chiral selector and D,L-serine as the substrate. Interestingly, the enzymic kinetic reaction rate of D-PPMER under UV irradiation at 36°C (9.2 x 10^-2 mM·min^-1) was 3.2-fold greater than that of the free enzyme (2.9 x 10^-2 mM·min^-1). This was because upon UV irradiation at high temperature, the P(SP) and P(N) moieties altered from a “stretched” to a “curled” state to encapsulate the enzyme in smaller cavities. The confinement effect of the cavities further improved the enzymic efficiency of the D-PPMER. This protocol highlights the outstanding potential of smart polymers, enables tunable control over the kinetic rates of stimuli-responsive enzyme reactors, and establishes a platform for adjusting enzymolysis efficiency using two different stimuli. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Application of 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Application of 27249-90-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis of long-chain Schiff bases containing ether and ester moieties by condensation of octadecylamine with vanillin, vanillal, and esters derived therefrom was written by Dikusar, E. A.;Potkin, V. I.;Kozlov, N. G.;Yuvchenko, A. P.. And the article was included in Russian Journal of General Chemistry in 2006.Recommanded Product: 20665-85-4 This article mentions the following:

Previously unknown long-chain Schiff bases containing ether and ester groups were synthesized by condensation of vanillin, vanillal, and esters derived therefrom with octadecylamine in anhydrous methanol. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Recommanded Product: 20665-85-4).

4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Recommanded Product: 20665-85-4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

A rapid and simple method for assay of nematicidal activity and its application to measuring the activities of dicarboxylic esters was written by Kimura, Yasuo;Mori, Masaaki;Hyeon, Suong-Be;Suzuki, Akinori;Mitsui, Yasushi. And the article was included in Agricultural and Biological Chemistry in 1981.Recommanded Product: malonic acid dibutyl ester This article mentions the following:

A method for nematocide bioassay is given, which differentiates between living and killed nematodes by letting the former descend from the incubation medium through a Japanese paper seal, followed by their count with a microscope. The method was applied to the study of the activity of dicarboxylic esters against the root nematode Pratylenchus coffeae. Of di-n-alkyl succinates tested, di-Pr succinate [925-15-5], di-Bu succinate [141-03-7], and diamyl succinate [645-69-2] were the most active. Branched alkyl succinates were less active. Six n-Bu esters of other dicarboxylic acids were also active, especially di-Bu glutarate [6624-57-3]. Since free acids and alcs. showed low activity, the ester linkage seems important. The preparation of the compounds is outlined. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Recommanded Product: malonic acid dibutyl ester).

malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Recommanded Product: malonic acid dibutyl ester

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics