Tag: M.W=100-150

Sheina, Elena E. published the artcileToward poly(3- and 3,4-alkoxythiophenes), Quality Control of 17236-59-8, the publication is Polymer Preprints (American Chemical Society, Division of Polymer Chemistry) (2003), 44(1), 843-844, database is CAplus.

Regioregular head-to-tail 3-alkoxy-substituted polythiophenes (PTs) (with R=C₆H₁₃O- and CH₃OC₂H₄OC₂H₄O-) and poly(2,5-(3-functionalized-3,4-ethylenedioxy)bithiophene) with dodecyl and diethyleneglycol Me Et as hydrophobic and hydrophilic substituents, resp., were polymerized via a Grignard Methathesis Method (GRIM). Mol. weights were characterized by gel permeation chromatog. (GPC) and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectroscopy, where the latter was used to obtain the end group composition UV-vis NIR spectroscopic studies showed that due to the presence of the electron donating oxygen atom, directly attached to the ring, the 3-alkoxy-substituted PTs possess a lower band gap than their alkyl analogs. The polymers self-oxidized in air and conductivity measurements revealed that further doping with I2 increases conductivity and prolongs the stability of the doped state. Poly(3-alkoxythiophenes) remain in the doped state for as long as three weeks.

Polymer Preprints (American Chemical Society, Division of Polymer Chemistry) published new progress about 17236-59-8. 17236-59-8 belongs to alcohols-buliding-blocks, auxiliary class Thiophene,Alcohol, name is Thiophen-3-ol, and the molecular formula is C8H15ClN2, Quality Control of 17236-59-8.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Motokura, Ken published the artcileCopper-Catalyzed Formic Acid Synthesis from CO₂ with Hydrosilanes and H₂O, Computed Properties of 597-52-4, the publication is Organic Letters (2012), 14(10), 2642-2645, database is CAplus and MEDLINE.

A copper-catalyzed formic acid synthesis from CO₂ with hydrosilanes has been accomplished. The Cu(OAc)₂·H₂O-1,2-bis(diphenylphosphino)benzene system is highly effective for the formic acid synthesis under 1 atm of CO₂. The TON value approached 8100 in 6 h. The reaction pathway was revealed by in situ NMR anal. and isotopic experiments

Organic Letters published new progress about 597-52-4. 597-52-4 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic Chain, name is Triethylsilanol, and the molecular formula is C6H16OSi, Computed Properties of 597-52-4.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Kraetzschmar, Felix published the artcileSelenium-Catalyzed C(sp³)-H Acyloxylation: Application in the Expedient Synthesis of Isobenzofuranones, Name: 4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-ol, the publication is Chemistry – A European Journal (2015), 21(19), 7030-7034, database is CAplus and MEDLINE.

Oxidative Se-catalyzed C(sp³)-H bond acyloxylation has been used to construct a diverse array of isobenzofuranones from simple ortho-allyl benzoic acid derivatives The synthetic procedure employs mild reaction conditions and gives high chemoselectivity enabled by an inexpensive organodiselane catalyst. E.g., in presence of N-fluorobenzenesulfonimide and PhSeSePh, C(sp³)-H acyloxylation of o-allylated benzoic acid (I) gave 81% isobenzofuranone derivative (II). The presented approach offers a new synthetic pathway toward the core structures of phthalide natural products.

Chemistry – A European Journal published new progress about 25240-59-9. 25240-59-9 belongs to alcohols-buliding-blocks, auxiliary class Boronic acid and ester,Boronic Acids,Boronate Esters, name is 4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-ol, and the molecular formula is C6H13BO3, Name: 4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-ol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Kawawaki, Tokuhisa published the artcileCreation of High-Performance Heterogeneous Photocatalysts by Controlling Ligand Desorption and Particle Size of Gold Nanocluster, Name: 2-Phenylethanethiol, the publication is Angewandte Chemie, International Edition (2021), 60(39), 21340-21350, database is CAplus and MEDLINE.

Recently, the creation of new heterogeneous catalysts using the unique electronic/geometric structures of small metal nanoclusters (NCs) has received considerable attention. However, to achieve this, it is extremely important to establish methods to remove the ligands from ligand-protected metal NCs while preventing the aggregation of metal NCs. In this study, the ligand-desorption process during calcination was followed for metal-oxide-supported 2-phenylethanethiolate-protected gold (Au) 25-atom metal NCs using five exptl. techniques. The results clearly demonstrate that the ligand-desorption process consists of ligand dissociation on the surface of the metal NCs, adsorption of the generated compounds on the support and desorption of the compounds from the support, and the temperatures at which these processes occurred were elucidated. Based on the obtained knowledge, we established a method to form a metal-oxide layer on the surface of Au NCs while preventing their aggregation, thereby succeeding in creating a water-splitting photocatalyst with high activity and stability.

Angewandte Chemie, International Edition published new progress about 4410-99-5. 4410-99-5 belongs to alcohols-buliding-blocks, auxiliary class Thiol,Benzene, name is 2-Phenylethanethiol, and the molecular formula is C8H10S, Name: 2-Phenylethanethiol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Manna, Cesar M. published the artcileStereoselective Catalysis Achieved through in Situ Desymmetrization of an Achiral Iron Catalyst Precursor, Synthetic Route of 597-52-4, the publication is Journal of the American Chemical Society (2015), 137(45), 14232-14235, database is CAplus and MEDLINE.

Stereoselective catalysis proceeds with catalyst control but without the need to synthesize preformed chiral catalysts or ligands. Fe-based catalysts were discovered to effect the stereoselective polymerization of lactides starting from a single achiral precursor and the proper choice of an achiral silanol additive. Spectroscopic anal. of the polymer revealed that the stereoselectivity originates from an enantiomorphic site rather than a chain end stereocontrol mechanism. Fe intermediates that are stereogenic at Fe probably form in situ as a result of desymmetrization that occurs from a change in the metal coordination number The proposed mechanism is supported by a combination of spectroscopic measurements, model complexes, kinetic measurements, and DFT calculations

Journal of the American Chemical Society published new progress about 597-52-4. 597-52-4 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic Chain, name is Triethylsilanol, and the molecular formula is C6H16OSi, Synthetic Route of 597-52-4.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Afanasenko, Anastasiia published the artcileA One-Pot Approach for Bio-Based Arylamines via a Combined Photooxidative Dearomatization-Rearomatization Strategy, Quality Control of 645-56-7, the publication is Chemistry – A European Journal (2022), 28(34), e202200309, database is CAplus and MEDLINE.

The synthesis of arylamines from renewable resources under mild reaction conditions is highly desired for the sustainability of the chem. industry, where the production of hazardous waste is a prime concern. However, to date, there are very few tools in chemists’ toolboxes that are able to produce arylamines in a sustainable manner. Herein, a robust one-pot approach for constructing bio-based arylamines via a combined photooxidative dearomatization-rearomatization strategy is presented. The developed methodol. enables the synthesis of structurally complex amines in moderate-to-good isolated yields using biomass-derived phenols, natural α-amino acids, and naphthols under remarkably mild reaction conditions. For the photooxygenation of phenols, a novel chrysazine-based catalyst system was introduced, demonstrating its efficiency for the synthesis of natural products – hallerone, rengyolone, and the pharmaceutically relevant prodrug DHED (10β-hydroxy-17β-hydroxyestra-1,4-dien-3-one).

Chemistry – A European Journal published new progress about 645-56-7. 645-56-7 belongs to alcohols-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 4-Propylphenol, and the molecular formula is C9H12O, Quality Control of 645-56-7.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Nojima, Susumu published the artcileSelective Oxidation with Aqueous Hydrogen Peroxide by [PO₄{WO(O₂)₂}₄]^3- Supported on Zinc-Modified Tin Dioxide, Computed Properties of 597-52-4, the publication is ChemCatChem (2015), 7(7), 1097-1104, database is CAplus.

The supported phosphorus-containing tetranuclear peroxotungstate ([PO₄{WO(O₂)₂}₄]^3-, denoted by PW4) catalysts by using zinc-modified SnO₂ supports with different zinc contents [PW₄-Zn(x)/SnO₂, in which x denotes the zinc content (wt%)] were prepared The supported catalysts, in particular PW4-Zn(0.8)/SnO₂, could act as efficient and reusable heterogeneous catalysts for selective oxidation with aqueous H₂O₂ as the terminal oxidant. The catalytic performance of PW4-Zn(0.8)/SnO₂ was much superior to those of the corresponding homogeneous analog THA₃PW4 (THA = tetra-n-hexylammonium) and the previously reported tungstate-based heterogeneous catalysts such as our W-Zn/SnO₂. In the presence of PW4-Zn(0.8)/SnO₂, various types of organic substrates such as alkenes, amines, silanes, and sulfides could be converted into the corresponding oxygenated products in high to excellent yields by using near-stoichiometric amounts of H₂O₂ with respect to the substrates (typically 1.2 equivalent). The PW4 species interacting with highly dispersed Zn²⁺ species on SnO₂ likely plays an important role in the present oxidation

ChemCatChem published new progress about 597-52-4. 597-52-4 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic Chain, name is Triethylsilanol, and the molecular formula is C6H16OSi, Computed Properties of 597-52-4.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Soeta, Takahiro published the artcileN-Heterocyclic Carbene-Catalyzed Chemoselective Monoacylation of 1,n-Linear Diols, Application In Synthesis of 111-29-5, the publication is Organic Letters (2021), 23(21), 8138-8142, database is CAplus and MEDLINE.

This paper discusses the N-heterocyclic carbene (NHC)-catalyzed redox monoacylation of 1,n-linear diols using α-benzoyloxyaldehydes. The reactions afforded monoacylated diols in moderate to good selectivities and chem. yields. Authors original NHC bearing a pyridine moiety plays an important role in achieving good chemoselectivities. A wide range of 1,n-linear diols were successfully applied to this reaction.

Organic Letters published new progress about 111-29-5. 111-29-5 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ploymers, name is Pentane-1,5-diol, and the molecular formula is C12H16O3, Application In Synthesis of 111-29-5.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Xu, Xiaotong published the artcileFormation pathway of disinfection by-products of lignin monomers in raw water during disinfection, Synthetic Route of 645-56-7, the publication is Science of the Total Environment (2022), 153706, database is CAplus and MEDLINE.

In this study, the dissolved organic matter (DOM) profiles of water samples from a water source in northeastern China were analyzed by high-resolution mass spectrometry (HRMS), and its changes after chlorination were investigated. The results showed that lignin substances accounted for a significant proportion in DOM and chlorinated products and were the main precursors of disinfection byproducts (DBPs). During disinfection, macromol. DOM was transformed into small mols., and lignin substances have the most obvious and complex changes in reaction. Two lignin monomers 4-propylphenol (4PP) and 4-propylguaiacol (4PG) were used as model compounds to study their reaction kinetics and degradation pathways during disinfection. The degradation of both lignin monomers conformed to pseudo-first-order reaction kinetics, and the reaction rate constant of 4PG was higher than that of 4PP. The effects of chlorine dosage, pH and temperature on the degradation reaction kinetics of two lignin monomers were investigated. The degradation rates of 4PP and 4PG increased with increasing chlorine dosage, pH and temperature The two monomers showed similar properties in the chlorination degradation process, and generated multiple intermediates, which were mainly transformed into small mols. by chlorine electrophilic substitution and nucleophilic substitution, and further generated DBPs.

Science of the Total Environment published new progress about 645-56-7. 645-56-7 belongs to alcohols-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 4-Propylphenol, and the molecular formula is C11H15NO3, Synthetic Route of 645-56-7.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Chen, Kai published the artcileCatalytic Amination of Phenols with Amines, COA of Formula: C9H12O, the publication is Journal of the American Chemical Society (2022), 144(3), 1144-1151, database is CAplus and MEDLINE.

Herein, a rhodium-catalyzed amination of phenols, which provided concise access to diverse anilines, with water as the sole byproduct was described. The arenophilic rhodium catalyst facilitated the inherently difficult keto-enol tautomerization of phenols by means of π-coordination, allowing for the subsequent dehydrative condensation with amines. The generality of this redox-neutral catalysis by carrying out reactions of a large array of phenols with various electronic properties and a wide variety of primary and secondary amines was demonstrated. Several examples of late-stage functionalization of structurally complex bioactive mols., including pharmaceuticals, further illustrated the potential broad utility of the method.

Journal of the American Chemical Society published new progress about 645-56-7. 645-56-7 belongs to alcohols-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 4-Propylphenol, and the molecular formula is C9H12O, COA of Formula: C9H12O.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts