Tag: 200-300

Thin thermo-responsive polymer films onto the pore system of chromatographic beads via reversible addition-fragmentation chain transfer polymerization was written by Roohi, Farnoosh;Titirici, Maria-Magdalena. And the article was included in New Journal of Chemistry in 2008.Electric Literature of C14H12S2 This article mentions the following:

Mesoporous silica beads modified with an azo initiator were used for grafting of a thermo-responsive polymer (poly-N-isopropylacrylamide, PNIPAAM) through reversible addition-fragmentation chain transfer (RAFT) mediated polymerization The RAFT mediation allowed an efficient control of the grafting process and led to suppression of the solution propagation preventing any visible gel formation. The resulting composites were characterized by FTIR spectroscopy, nitrogen adsorption anal., elemental anal., transmission and SEM and as thermo-responsive stationary phases in chromatog. The resulting material proved to be efficient for the separation of a mixture of five hydrophobic steroids and the retention time and efficiency of separation improved with increasing the column temperature above the lowest critical solution temperature of PNIPAAM. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Electric Literature of C14H12S2).

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. 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.Electric Literature of C14H12S2

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

A series of novel HDAC inhibitors with anthraquinone as a cap group was written by Zou, Yefang;Cao, Zhuoxian;Wang, Jie;Chen, Xiaoxue;Chen, Yan-qin;Li, Yan;Liu, Jingzi;Zhao, Yonglong;Wang, Aimin;He, Bin. And the article was included in Chemical & Pharmaceutical Bulletin in 2020.Recommanded Product: 3903-40-0 This article mentions the following:

Although anthraquinone derivatives possess significant antitumor activity, most of them also displayed those side effects like cardiotoxicity, mainly owing to their inhibition of topoisomerase II of DNA repair mechanisms. Our raised design strategy by switching therapeutic target from topoisomerase II to histone deacetylase (HDAC) has been applied to the design of anthraquinone derivatives in current study. Consequently, a series of novel HDAC inhibitors with a tricylic diketone of anthraquinone as a cap group have been synthesized. After screening and evaluation, compounds 4b, 4d, 7b and 7d have displayed the comparable inhibition in enzymic activity and cell proliferation than that of Vorinostat (SAHA). Notably, compound 4b showed certain selectivity of antiproliferative effects on cancer cell lines over non-cancer cell lines. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Recommanded Product: 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Recommanded Product: 3903-40-0

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

Catalytic synthesis of 2,2′-arylmethylenebis(3-hydroxy-5,5-dimethylcyclohex-2-en-1-ones) and 3,3,6,6-tetramethyl-9-aryl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-diones was written by Dikusar, E. A.;Potkin, V. I.;Kozlov, N. G.;Pavlyuchenkova, A. S.;Murashova, M. Yu.;Petkevich, S. K.;Kletskov, A. V.;Polikarpov, A. P.;Ogorodnikova, M. M.;Zolotar’, R. M.;Chepik, O. P.. And the article was included in Russian Journal of Organic Chemistry in 2013.Name: 4-Formyl-2-methoxyphenyl isobutyrate This article mentions the following:

Hexahydroxanthenediones I [R = Ph, 4-HOC₆H₄, 4-MeOC₆H₄, 4-HO₂CC₆H₄, 2,4-(HO)₂C₆H₃, 2-HO-3-MeOC₆H₃, 3-HO-4-MeOC₆H₃, 1,3-benzodioxol-5-yl, 3-MeO-4-HOC₆H₃, 2-Br-4,5-(MeO)₂C₆H₂, 3-MeO-4-R¹COOC₆H₃, 3-EtO-4-HOC₆H₃, 3-EtO-4-R¹COOC₆H₃, 3-MeO-4-R²COOC₆H₃, 3-EtO-4-R²COOC₆H₃, 3-MeO-4-R³COOC₆H₃, 3-EtO-4-R³COOC₆H₃, 3-MeO-4-R⁴COOC₆H₃, 3-EtO-4-R⁴COOC₆H₃; R¹ = Me(CH₂)_n, Me₂CH, Me₂CHCH₂, Me₃CH, Me₂CHCH₂CH₂, Ph; R² = 5-phenyl-3-isoxazolyl; R³ = 5-(4-methylphenyl)-3-isoxazolyl; R⁴ = 4,5-dichloro-3-isothiazolyl; n = 0-4, 8, 11, 16] were prepared in two steps from aryl aldehydes RCHO and dimedone (5,5-dimethyl-1,3-cyclohexanedione) or from acid chlorides R³COCl or R⁴COCl and I [R = 3-MeO-4-HOC₆H₄, 3-EtO-4-HOC₆H₄]. Condensation of benzaldehydes RCHO [R = Ph, 4-HOC₆H₄, 4-MeOC₆H₄, 4-HO₂CC₆H₄, 2,4-(HO)₂C₆H₃, 2-HO-3-MeOC₆H₃, 3-HO-4-MeOC₆H₃, 1,3-benzodioxol-5-yl, 3-MeO-4-HOC₆H₃, 2-Br-4,5-(MeO)₂C₆H₂, 3-MeO-4-R¹COOC₆H₃, 3-EtO-4-HOC₆H₃, 3-EtO-4-R¹COOC₆H₃, 3-MeO-4-R²COOC₆H₃, 3-EtO-4-R²COOC₆H₃, 3-MeO-4-R³COOC₆H₃, 3-EtO-4-R³COOC₆H₃, 3-MeO-4-R⁴COOC₆H₃, 3-EtO-4-R⁴COOC₆H₃; R¹ = Me(CH₂)_n, Me₂CH, Me₂CHCH₂, Me₃CH, Me₂CHCH₂CH₂, Ph; R² = 5-phenyl-3-isoxazolyl; n = 0-4, 8, 11, 16] with dimedone gave arylmethylenebis(dimethylhydroxycyclohexenones) (or in some cases provided I directly). Cyclocondensation of the intermediate arylmethylenebis(dimethylhydroxycyclohexenones) in the presence of the sulfo cation exchanger FIBAN K-1 gave hexahydroxanthenediones. In some cases, the arylisoxazolylcarboxylic and dichloroisothiazolylcarboxylic esters underwent partial or full hydrolysis during the (attempted) preparation of the corresponding hexahydroxanthenediones. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Name: 4-Formyl-2-methoxyphenyl isobutyrate).

4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) 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. 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.Name: 4-Formyl-2-methoxyphenyl isobutyrate

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

Regioselective functionalization of nonactivated CH bonds. 2. Photochemical functionalization of the myristoyl group in 1,2-alkanediyl and o-phenylene 4-benzoylbenzoate myristates was written by Dors, Bernhard;Luftmann, Heinrich;Schaefer, Hans J.. And the article was included in Chemische Berichte in 1983.Recommanded Product: 3903-40-0 This article mentions the following:

Me(CH₂)₁₂CO₂QO₂CC₆H₄COPh-4 (Q = CH₂CH₂, trans-1,2-cyclohexanediyl, o-phenylene) were prepared and cyclized photochem. to I, which were converted to Me 7- to 13-oxomyristates. This ketofunctionalization of the remote CH₂ groups in myristic acid was more selective than in 4-PhCOC₆H₄CO₂(CH₂)_nMe (n = 11, 15, 16, 17), and the maximum functionalization occurred more toward the middle, rather than the end, of the chain. The solvent polarity had only a small effect on the selectivity. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Recommanded Product: 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) 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. Esters contain a carbonyl center, which gives rise to 120掳 C鈥揅鈥揙 and O鈥揅鈥揙 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C鈥揙鈥揅 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: 3903-40-0

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

A Highly Stereoselective Organocatalytic Tandem Aminoxylation/Aza-Michael Reaction for the Synthesis of Tetrahydro-1,2-Oxazines was written by Zhu, Di;Lu, Min;Chua, Pei Juan;Tan, Bin;Wang, Fei;Yang, Xinhao;Zhong, Guofu. And the article was included in Organic Letters in 2008.Formula: C11H20O4 This article mentions the following:

A facile stereoselective synthesis of multifunctionalized tetrahydro-1,2-oxazines (THOs) has been achieved by the organocatalyzed asym. tandem 伪-aminoxylation/aza-Michael reaction for the C-O/C-N bond formations in moderate to good yields with excellent diastereo- (>99:1 dr) and enantioselectivities (92% to >99% ee). E.g., reaction of di-Me 2-(5-oxopentylidene)malonate (I) with nitrosobenzene, catalyzed by L-proline, gave 84% tetrahydro-1,2-oxazine II (98% ee). In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Formula: C11H20O4).

malonic acid dibutyl ester (cas: 1190-39-2) 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. 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.Formula: C11H20O4

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

Identification of Inhibitors of Checkpoint Kinase 1 through Template Screening was written by Matthews, Thomas P.;Klair, Suki;Burns, Samantha;Boxall, Kathy;Cherry, Michael;Fisher, Martin;Westwood, Isaac M.;Walton, Michael I.;McHardy, Tatiana;Cheung, Kwai-Ming J.;Van Montfort, Rob;Williams, David;Aherne, G. Wynne;Garrett, Michelle D.;Reader, John;Collins, Ian. And the article was included in Journal of Medicinal Chemistry in 2009.SDS of cas: 173341-02-1 This article mentions the following:

Checkpoint kinase I (CHKI) is an oncol. target of significant current interest. Inhibition of CHK1 abrogates DNA damage-induced cell cycle checkpoints and sensitizes p53 deficient cancer cells to genotoxic therapies. Using template screening, a fragment-based approach to small mol. hit generation, we have identified multiple CHK1 inhibitor scaffolds suitable for further optimization. The sequential combination of in silico low mol. weight template selection, a high concentration biochem. assay and hit validation through protein-ligand X-ray crystallog. provided 13 template hits from an initial in silico screening library of ca. 15000 compounds The use of appropriate counter-screening to rule out nonspecific aggregation by test compounds was essential for optimum performance of the high concentration bioassay. One low mol. weight, weakly active purine template hit was progressed by iterative structure-based design to give submicromolar pyrazolopyridines with good ligand efficiency and appropriate CHK1-mediated cellular activity in HT29 colon cancer cells. In the experiment, the researchers used many compounds, for example, tert-Butyl (morpholin-2-ylmethyl)carbamate (cas: 173341-02-1SDS of cas: 173341-02-1).

tert-Butyl (morpholin-2-ylmethyl)carbamate (cas: 173341-02-1) 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掳 C鈥揅鈥揙 and O鈥揅鈥揙 angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C鈥揙鈥揅 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. SDS of cas: 173341-02-1

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

Regioselective functionalization of nonactivated CH bonds. 2. Photochemical functionalization of the myristoyl group in 1,2-alkanediyl and o-phenylene 4-benzoylbenzoate myristates was written by Dors, Bernhard;Luftmann, Heinrich;Schaefer, Hans J.. And the article was included in Chemische Berichte in 1983.Recommanded Product: 3903-40-0 This article mentions the following:

Me(CH₂)₁₂CO₂QO₂CC₆H₄COPh-4 (Q = CH₂CH₂, trans-1,2-cyclohexanediyl, o-phenylene) were prepared and cyclized photochem. to I, which were converted to Me 7- to 13-oxomyristates. This ketofunctionalization of the remote CH₂ groups in myristic acid was more selective than in 4-PhCOC₆H₄CO₂(CH₂)_nMe (n = 11, 15, 16, 17), and the maximum functionalization occurred more toward the middle, rather than the end, of the chain. The solvent polarity had only a small effect on the selectivity. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Recommanded Product: 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) 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. 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: 3903-40-0

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

A Highly Stereoselective Organocatalytic Tandem Aminoxylation/Aza-Michael Reaction for the Synthesis of Tetrahydro-1,2-Oxazines was written by Zhu, Di;Lu, Min;Chua, Pei Juan;Tan, Bin;Wang, Fei;Yang, Xinhao;Zhong, Guofu. And the article was included in Organic Letters in 2008.Formula: C11H20O4 This article mentions the following:

A facile stereoselective synthesis of multifunctionalized tetrahydro-1,2-oxazines (THOs) has been achieved by the organocatalyzed asym. tandem α-aminoxylation/aza-Michael reaction for the C-O/C-N bond formations in moderate to good yields with excellent diastereo- (>99:1 dr) and enantioselectivities (92% to >99% ee). E.g., reaction of di-Me 2-(5-oxopentylidene)malonate (I) with nitrosobenzene, catalyzed by L-proline, gave 84% tetrahydro-1,2-oxazine II (98% ee). In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Formula: C11H20O4).

malonic acid dibutyl ester (cas: 1190-39-2) 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. 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.Formula: C11H20O4

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

Synthesis and Characterization of 12-Tungstosilicic Acid Anchored to MCM-41 as well as Its Use as Environmentally Benign Catalyst for Synthesis of Succinate and Malonate Diesters was written by Brahmkhatri, Varsha;Patel, Anjali. And the article was included in Industrial & Engineering Chemistry Research in 2011.Quality Control of malonic acid dibutyl ester This article mentions the following:

12-Tungstosilisic acid anchored to MCM-41 was synthesized and characterized by various physicochem. techniques such as thermogravimetric anal. (TGA), Fourier transform IR (FT-IR), laser-Raman spectroscopy, diffuse reflectance spectroscopy (DRS), N₂ adsorption-desorption, ²⁹Si-magic-angle spinning (MAS) NMR, x-ray diffraction, SEM, and TEM. The total acidity was determined by Bu amine titration The types of acidic sites (acidic strength) were determined by potentiometric titration The use of synthesized material was explored for esterification of diacarboxylic acids with butanol. Influence of various reaction parameters (catalyst concentration, acid/alc. molar ratio and reaction time) on catalytic performance was studied. The catalyst shows high activity in terms of higher yields toward diesters, especially for dioctyl succinate and dioctyl malonate. The catalyst was also regenerated and reused for four cycles. All these characteristics imply the high potential of an environmentally benign catalyst for synthesis of succinate and malonate diesters. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Quality Control of malonic acid dibutyl ester).

malonic acid dibutyl ester (cas: 1190-39-2) 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. Polyesters are important plastics, with monomers linked by ester moieties. 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.Quality Control of malonic acid dibutyl ester

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

Direct catalytic asymmetric Mannich reactions of malonates and β-keto esters was written by Marigo, Mauro;Kjaersgaard, Anne;Juhl, Karsten;Gathergood, Nicholas;Jorgensen, Karl Anker. And the article was included in Chemistry – A European Journal in 2003.Computed Properties of C11H20O4 This article mentions the following:

The first catalytic asym. direct Mannich reaction of malonates and β-keto esters has been developed. Malonates react with an activated N-tosyl-α-imino ester catalyzed by chiral tert-butyl-bisoxazoline/Cu(OTf)₂ to give the Mannich adducts in high yields and with up to 96% ee. These reactions create a chiral quaternary carbon center and it is demonstrated that this new direct Mannich reactions provides for example a new synthetic procedure for the formation of optically active β-carboxylic ester α-amino acid derivatives A series of different β-keto esters with various ester substituents has been screened as substrates for the catalytic asym. direct Mannich reaction and it was found that the best results in terms of yield, diastereo- and enantioselectivity were obtained when tert-Bu esters of β-keto esters were used as the substrate. The reaction of different β-keto tert-Bu esters with the N-tosyl-α-imino ester gave the Mannich adducts in high yields, diastereo- and enantioselectivities (up to 95% ee) in the presence of chiral tert-butyl-bisoxazoline/Cu(OTf)₂ as the catalyst. To expand the synthetic utility of this direct Mannich reaction, a diastereoselective decarboxylation reaction was developed for the Mannich adducts leading to a new synthetic approach to attractive optically active β-keto α-amino acid derivatives Based on the stereochem. outcome of the reactions, various approaches of the N-tosyl-α-imino ester to the chiral bisoxazoline/Cu^II-substrate intermediate are discussed. In the experiment, the researchers used many compounds, for example, Diethyl isobutylmalonate (cas: 10203-58-4Computed Properties of C11H20O4).

Diethyl isobutylmalonate (cas: 10203-58-4) 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. Computed Properties of C11H20O4

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