Month: December 2022

Blum, Jochanan published the artcileKinetic resolution of racemic 2,2′-bis(trifluoromethane-sulfonyloxy)-1,1′-binaphthalene by chiral dimethylaluminum complexes and an achiral Pd catalyst, as well as by achiral dimethylaluminum reagents in the presence of a chiral Pd catalyst, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), the publication is Tetrahedron Letters (1998), 39(31), 5611-5614, database is CAplus.

Kinetic resolution of the racemic title binaphthalene was shown to take place during its methylation with either (Me₂AlOCH₂CH₂OMe)₂ or Me₂Al(CH₂)₃NMe₂ in the presence of an optically active Pd(binap) catalyst, as well as during its alkylation with either (S)-(+)-[Me₂AlOCH₂CH(Me)OCH₂Ph]₂ or (S)-(+)-[Me₂AlOCH₂CH(CH₂CHMe₂)NMe₂]₂ in the presence of an achiral palladium complex to give the Me trifluorosulfonyloxybinaphthalene. The ee values of the resolved binaphthyl derivatives by the two methods were up to 69 and 12%, resp. The latter method represents the first application of a stabilized dialkylaluminum complex with a chiral chelating ligand for asym. induction.

Tetrahedron Letters published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C22H12F6O6S2, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate).

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

Riadi, Yassine published the artcileSynergistic Catalytic Effect of the Combination of Deep Eutectic Solvents and Hierarchical H-TiO₂ Nanoparticles toward the Synthesis of Benzimidazole-Linked Pyrrolidin-2-One Heterocycles: Boosting Reaction Yield, Recommanded Product: Dimethyl itaconate, the publication is Polycyclic Aromatic Compounds, database is CAplus.

Synthesis of bioactive heterocyclic compounds comprising pyrrolidinone linked to a benzimidazole moiety I (X = 2-Me, 3-F-4-Cl, 4-OH, etc.) by an eco-friendly and efficient route was investigated. The targeted scaffolds were synthesized from substituted arylamines XC₆H₄NH₂ and available o-phenylenediamine under ultrasonic irradiation in the presence of a mixture of a deep eutectic solvent (DES) and hierarchical TiO₂ (H-TiO₂) microspheres as a green catalytic system. Two DESs were synthesized by sep. mixing FeCl₂ and CuCl₂ with urea. On the other hand, hierarchical TiO₂ (H-TiO₂) was synthesized by a solvothermal route and characterized by XRD, SEM, Raman spectroscopy, and XPS. The results demonstrate that the best reaction yields are obtained by using H-TiO₂ microspheres in the DES. Besides, the synthesized compounds were screened for their antibacterial activity against different bacteria. Overall, eight derivatives were confirmed to exhibit antibacterial activity.

Polycyclic Aromatic Compounds 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, Recommanded Product: Dimethyl itaconate.

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

Nolla-Saltiel, Roberto published the artcileHydrophosphination of Activated Alkenes by a Cobalt(I) Pincer Complex, SDS of cas: 627-93-0, the publication is Advanced Synthesis & Catalysis (2020), 362(15), 3148-3157, database is CAplus.

Herein is reported the synthesis of three heteroleptic first-row transition metal(II) complexes containing carbazolido NNN pincer ligands and conversion to the corresponding metal(I)-carbonyl complexes via a reductive carbonylation route. These complexes are precatalysts for the hydrophosphination of activated alkenes, affording a cobalt-catalyzed hydrophosphination process that solely and selectively yields the β addition (anti-Markovnikov) product. The scope of this transformation has been investigated using a variety of activated alkenes. Isolation and characterization of substrate-coordinated intermediates reveal available coordination sites, which provide insight into the proposed catalytic cycle.

Advanced Synthesis & Catalysis 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, SDS of cas: 627-93-0.

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

Liu, Shiyu published the artcileTuning Molecular Composition for Better Cross-section Homogeneity of Thermal Oxidative Stabilized Polyacrylonitrile for Carbon Materials, Recommanded Product: Dimethyl itaconate, the publication is Fibers and Polymers (2022), 23(6), 1515-1524, database is CAplus.

A strategy to improve the cross-section homogeneity of thermal oxidative stabilized polyacrylonitrile for carbon materials was provided in the present work. A kind of comonomer, di-Me itaconate (DMI), which possesses two bulky side groups was introduced into poly(acrylonitrile-co-itaconic acid). The efficiency of DMI in improving the cross-section homogeneity of polyacrylonitrile films during thermal oxidative stabilization (TOS) processes and the properties of resulted PAN-based carbon materials were investigated in detail. It was found that DMI facilitated the formation of longer cyclic structures, higher oxygen content, more homogeneous cross-section fracture morphol. and denser structure during TOS process. DMI was also benefit for easing heat release. The presence of DMI also facilitated a smaller I_D/I_G value of the carbonized PAN film and a bigger in-plane size of graphite crystals L_a.

Fibers and Polymers 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, Recommanded Product: Dimethyl itaconate.

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

Zhang, Zhanhui published the artcileSynthesis and characterization of optically active, main-chain, liquid crystalline polyesters, Quality Control of 50670-76-3, the publication is Polymer Preprints (American Chemical Society, Division of Polymer Chemistry) (1999), 40(2), 880-881, database is CAplus.

Optically active, main-chain, liquid crystalline polyether-polyesters were prepared via room temperature polymerization The samples of the polyester had number-average mol.-weights 12,000-41,900 g/mol, the weight-average mol.-weights 24,500-135,000 g/mol and T_g 37-39° as determined by DSC anal. The polymers could be solution-cast into tough, flexible films or spun into fibers. Thermogravimetric anal. (TGA) of the polymers showed a 5% weight loss at 315-330°, indicating that these chiral polyesters have good thermal stability. The liquid crystalline phases of both the monomer and the polymer were studied by polarized light microscope (PLM).

Polymer Preprints (American Chemical Society, Division of 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 C18H15N3O3, Quality Control of 50670-76-3.

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

Bai, Feng published the artcileSynthesis of a biphenyl-containing, achiral, V-shaped liquid crystalline polyester, SDS of cas: 50670-76-3, the publication is Polymer Preprints (American Chemical Society, Division of Polymer Chemistry) (1999), 40(2), 878-879, database is CAplus.

A new V-shaped liquid crystalline monomer 1,3-Ph bis[4′-(11-hydroxyundecanyloxy)-4-biphenyl]carboxylate was synthesized from 4′-hydroxy-4-biphenylcarboxylic acid, resorcinol, and 11-bromo-1-undecanol. The polymer was prepared by condensing monomer with isophthalic acid under mild condition using 1,3-dicyclohexylcarbodiimide as condensing reagent in the presence of N,N-dimethylaminopyridinium toluenesulfonate.

Polymer Preprints (American Chemical Society, Division of 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, SDS of cas: 50670-76-3.

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

Olmos, Andrea published the artcileMeasuring the Relative Reactivity of the Carbon-Hydrogen Bonds of Alkanes as Nucleophiles, Recommanded Product: Ethyltert-butylacetate, the publication is Angewandte Chemie, International Edition (2018), 57(42), 13848-13852, database is CAplus and MEDLINE.

We report quant. measurements of the relative reactivities of a series of C-H bonds of gaseous or liquid C_nH_2n+2 alkanes (n = 1-8, 29 different C-H bonds) towards in situ generated electrophiles (copper, silver, and rhodium carbenes), with methane as the reference This strategy surpasses the drawback of previous model reactions of alkanes with strong electrophiles suffering from C-C cleavage processes, which precluded direct comparison of the relative reactivities of alkane C-H bonds.

Angewandte Chemie, International Edition 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, Recommanded Product: Ethyltert-butylacetate.

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

Polanski, Jaroslaw published the artcileThe comparison of molecular surfaces by neural networks and its applications to quantitative structure activity studies, Safety of Ethyltert-butylacetate, the publication is Quantitative Structure-Activity Relationships (1998), 17(1), 27-36, database is CAplus.

Self-organizing Kohonen neural networks are used to obtain quant. structure-activity relationships. Simple mols. were selected to discuss the essential features of the transformation. Descriptors calculated from maps obtained from comparative studies with template mols. applied to the anal. of compounds derived from butane, as well as Et carboxylates and nitroanilines and aminobenzonitriles (sweet-tasting compounds) can be correlated with various mol. effects.

Quantitative Structure-Activity Relationships 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, Safety of Ethyltert-butylacetate.

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

Bruusgaard-Mouritsen, Maria A. published the artcileFacial contact dermatitis caused by cosmetic-relevant allergens, Product Details of C10H12O5, the publication is Contact Dermatitis (2021), 85(6), 650-659, database is CAplus and MEDLINE.

Facial allergic contact dermatitis caused by cosmetic products is common. New allergens in cosmetics continuously emerge. To investigate characteristics of patients with facial dermatitis (FD) between 2010 and 2019 including patch test results from cosmetic-related allergens and a new test series with cosmetic-relevant natural ingredients (CRNIs). This is a retrospective study analyzing demographics, clin. characteristics according to MOAHLFA index (male; occupation; atopic dermatitis; hand; leg; face; age ≥ 40 years), and patch test results to 27 cosmetic-relevant allergens in FD patients. A prospective study evaluating a screening test series with CRNIs in consecutive FD patients for 1 yr was also conducted. These patients received a questionnaire for collecting extra characteristics (eg, concerning quality of life). Of 8740 tested patients, 2292 (26.2%) had FD. Of these, 30.6% had cosmetic-induced FD. The most common cosmetic-related allergens were fragrances and preservatives. The most common patch test-pos. CRNIs were hydroperoxides of limonene and linalool, and propolis. Potato and peanut were rare, but the most common prick test-pos. CRNIs, however, without any relation to the use of cosmetic products. FD affected nearly all patients′ quality of life and caused limitations to their daily life. Updated management and quick diagnosis of FD is important to avoid neg. impact on patients′ quality of life.

Contact Dermatitis published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, Product Details of C10H12O5.

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

Ho, Dang Binh published the artcileDevelopment of a Modified System to Provide Improved Diastereocontrol in the Linear-Selective Cu-Catalyzed Reductive Coupling of Ketones and Allenamides, COA of Formula: C42H63O3P, the publication is Journal of Organic Chemistry (2022), 87(4), 2142-2153, database is CAplus and MEDLINE.

Chiral γ-lactones are prevalent organic architectures found in a large array of natural products. In this work, authors disclose the development of a modified catalytic system utilizing a com. available Cu-phosphite catalyst for the diastereoselective reductive coupling of chiral allenamides and ketones to afford chiral γ-lactone precursors in 80:20 to 99:1 dr.

Journal of Organic Chemistry 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, COA of Formula: C42H63O3P.

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