Month: December 2022

Li, Zhi-Yun published the artcilePayne Effect and Weak Overshoot in Rubber Nanocomposites, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is rubber nanocomposite Payne effect rheol property.

Payne effect and its associated weak overshoot are of importance for understanding and regulating the softening of rubber nanocomposites under large amplitude oscillations. Herein, Payne effect in diverse filled vulcanizates is investigated for generalizing the common characteristics. Master curves of strain amplitude dependent storage modulus are created with respect to microscopic strain amplitude of the matrix, revealing a matrix-dominated elastic nonlinearity being independent of type and dispersity of filler, crosslinking d. and sol fraction of matrix and filler-rubber interfacial interactions. However, carbonaceous fillers with higher affinity to the rubber matrixes yield lower strain amplification and higher overshoot behavior in comparison with siliceous silica. The investigation would be illuminating for preparing rubber nanocomposites with optimized reinforcement and softening performances.

Chinese Journal of Polymer Science published new progress about Carbon black Role: MOA (Modifier or Additive Use), USES (Uses) (N 330). 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Liu, Fangbei published the artcilePhotoresponsive Azobenzene-Functionalized Shell Cross-Linked Micelles for Selective Asymmetric Transfer Hydrogenation, Quality Control of 7575-23-7, the main research area is arylethanone SCM azobenzene catalyst enantioselective asym transfer hydrogenation; arylethanol preparation.

Described the substrate-selective asym. transfer hydrogenation of aromatic ketones using rhodium complexes immobilized on a photoresponsive nanoreactor. The nanoreactor switches its morphol. upon light irradiation in a wavelength-selective manner. Kinetic studies showed that the gated behavior in the crosslinking layer was key to discriminating among substrates and reagents during catalysis. Under UV light irradiation, the nanoreactor displayed substrate selectivity, converting smaller ketone substrates faster to the corresponding secondary alcs.

Organic Letters published new progress about Aralkyl alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Quality Control of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Jones, Kevin M. published the artcileMetal-Free Dihydroxylation of Alkenes using Cyclobutane Malonoyl Peroxide, Formula: C8H9BrO2, the main research area is lactone preparation green chem; allylic alc preparation green chem; alkene dihydroxylation cyclobutane malonoyl peroxide.

Cyclobutane malonoyl peroxide I, prepared in a single step from the com. available diacid 6, is an effective reagent for the dihydroxylation of alkenes. Reaction of a chloroform solution of I with an alkene in the presence of 1 equiv of water at 40 °C followed by alk. hydrolysis leads to the corresponding diol, e.g., II, in 30-84% yield. With 1,2-disubstituted alkenes, the reaction proceeds with syn-selectivity (3:1 → 50:1). A mechanism consistent with exptl. findings is proposed, which is supported by deuterium and oxygen labeling studies and explains the stereoselectivity observed Alternative reaction pathways that are dependent on the structure of the starting alkene are also described leading to the synthesis of allylic alcs. and γ-lactones.

Journal of Organic Chemistry published new progress about Allylic alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 92093-23-7 belongs to class alcohols-buliding-blocks, name is 1-(4-Bromophenyl)ethane-1,2-diol, and the molecular formula is C8H9BrO2, Formula: C8H9BrO2.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Song, Qing-Wen published the artcileSelective Conversion of CO2 and Switchable Alcohols into Linear or Cyclic Carbonates via Versatile Zinc Catalysis, Recommanded Product: 3,5-Dimethylhex-1-yn-3-ol, the main research area is alc carbon dioxide zinc catalyst; carbonate preparation; dioxolanone preparation.

Herein, selective catalytic conversion of CO2 and switchable alc. candidates to produce linear or cyclic carbonates and α-hydroxy ketones via effective zinc catalyst was developed. A series of primary alcs. and cyclohexanol, 1,2-diols, and water can serve as nucleophiles to give alkyl or aryl 2-substituted-3-oxobutan-2-yl carbonates, substituted 1,3-dioxolan-2-ones, 3-substituted 3-hydroxybutan-2-ones, resp. with excellent selectivity and high yields.

Synthesis published new progress about Alcohols, unsaturated Role: RCT (Reactant), RACT (Reactant or Reagent). 107-54-0 belongs to class alcohols-buliding-blocks, name is 3,5-Dimethylhex-1-yn-3-ol, and the molecular formula is C8H14O, Recommanded Product: 3,5-Dimethylhex-1-yn-3-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Diaz, Irina published the artcileCombined effects of sulfur dioxide, glutathione and light exposure on the conservation of bottled Sauvignon blanc, Category: alcohols-buliding-blocks, the main research area is Wine Oxidation Light exposure Antioxidants Storage; Antioxidants; Light exposure; Oxidation; Storage; Wine.

Oxygen exposure may trigger a series of changes that could be detrimental to the quality white wines. This study evaluated the combined effects of sulfur dioxide, glutathione and light exposure on the chem. and sensory perception of bottled Sauvignon blanc. The wines were manually bottled into clear bottles, closed with low oxygen transfer rate stoppers, and stored for three months, either exposed or protected from light. The wines exposed to artificial light showed higher rates of sulfite loss and oxygen consumption, were significantly darker in color, exhibited significant changes in the concentration of phenolics and volatile compounds, were perceived as less fruity/floral, and had higher nuances of solvent, earthy and honey aromas than the ones protected from light. The treatments with higher amounts of initial sulfites and glutathione were able to delay some of these changes but were less significant than protecting the wines from artificial light.

Food Chemistry published new progress about Polyphenols (nonpolymeric) Role: ANT (Analyte), ANST (Analytical Study). 505-10-2 belongs to class alcohols-buliding-blocks, name is 3-(Methylthio)propan-1-ol, and the molecular formula is C4H10OS, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Das, Uttam Kumar published the artcileDehydrogenative Cross-Coupling of Primary Alcohols To Form Cross-Esters Catalyzed by a Manganese Pincer Complex, Category: alcohols-buliding-blocks, the main research area is primary alc manganese pincer complex catalyst dehydrogenative cross coupling; cross ester preparation.

Base-metal-catalyzed dehydrogenative cross-coupling of primary alcs. to form cross-esters as major products, liberating hydrogen gas, is reported. The reaction is catalyzed by a pincer complex of earth-abundant manganese in the presence of catalytic base, without any hydrogen acceptor or oxidant. Mechanistic insight indicates that a dearomatized complex is the actual catalyst, and indeed this independently prepared dearomatized complex catalyzes the reaction under neutral conditions.

ACS Catalysis published new progress about Carboxylic esters Role: SPN (Synthetic Preparation), PREP (Preparation). 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Oliveira, Paulo Marcelo Rayner published the artcileExposure of Catasetum fimbriatum aerial roots to light coordinates carbon partitioning between source and sink organs in an auxin dependent manner, Formula: C4H6O5, the main research area is Catasetum aerial root carbon partitioning auxin organic acid light; Auxin; Carbon partitioning; Carbon sources; Catasetum; Light; Orchid; Roots.

Light energy is essential for carbon metabolism in plants, as well as controlling the transport of metabolites between the organs. While terrestrial plants have a distinct structural and functional separation between the light exposed aerial parts and the non-exposed roots, epiphytic plants, such as orchids, have shoots and roots simultaneously fully exposed to light. The roots of orchids differ mainly from non-orchidaceous plants in their ability to photosynthesize. Since the roots of Catasetum fimbriatum can synthesize auxin which is acropetally transported to the shoot region, we decided to investigate whether: (1) light treatment of C. fimbriatum roots raises the auxin levels in the plant; and (2) distinct auxin concentrations can change the source-sink relationships, altering the amounts of sugars and organic acids in leaves, pseudobulbs and roots. Among the organs studied, the roots accumulated the highest concentrations of indole-3-acetic-acid (IAA); and when roots were exposed to light, IAA accumulated in the leaves. However, when polar auxin transport (PAT) was blocked with N-(1-Naphthyl)phthalamic acid (NPA) treatment, a significant accumulation of sugars and organic acids occurred in the pseudobulbs and leaves, resp., suggesting that auxin flux from roots to shoots was involved in carbon partitioning of the aerial organs. Considering that C. fimbriatum plants lose all their leaves seasonally, it is possible the roots are a substituting influence on the growth and development of this orchid during its leafless period.

Plant Physiology and Biochemistry (Issy-les-Moulineaux, France) published new progress about Auxins Role: DGN (Diagnostic Use), BIOL (Biological Study), USES (Uses). 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Formula: C4H6O5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Polshettiwar, Vivek published the artcileNano-organocatalyst: magnetically retrievable ferrite-anchored glutathione for microwave-assisted Paal-Knorr reaction, aza-Michael addition, and pyrazole synthesis, Name: 3-(1H-Pyrrol-1-yl)propan-1-ol, the main research area is Paal Knorr aza Michael pyrazole synthesis microwave glutathione nanocatalyst.

Postsynthetic surface modification of magnetic nanoparticles by glutathione imparts desirable chem. functionality and enables the generation of catalytic sites on the surfaces of ensuing organocatalysts. In this article, we discuss the developments, unique activity, and high selectivity of nano-organocatalysts for microwave-assisted Paal-Knorr reaction, aza-Michael addition, and pyrazole synthesis. Their insoluble character coupled with paramagnetic nature enables easy separation of these nano-catalysts from the reaction mixture using external magnet, which eliminates the requirement of catalyst filtration.

Tetrahedron published new progress about Amino acid esters Role: SPN (Synthetic Preparation), PREP (Preparation). 50966-69-3 belongs to class alcohols-buliding-blocks, name is 3-(1H-Pyrrol-1-yl)propan-1-ol, and the molecular formula is C7H11NO, Name: 3-(1H-Pyrrol-1-yl)propan-1-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Reynard, Guillaume published the artcileEtherification of phenols by amines via transient diazonium intermediates, Related Products of alcohols-buliding-blocks, the main research area is phenol alkyl amine propanedinitrite etherification; alkyl phenyl ether preparation.

The synthesis of alkyl aryl ethers from electron poor phenols and amines using 1,3-propanedinitrite was described. Due to the mild conditions, functionalized primary, secondary and tertiary alkyl groups were successfully introduced, denoting a highly tolerant process that allowed for unprotected alcs. and acetals. The reaction was thought to proceeded through the formation of a diazonium intermediate that undergoes subsequent SN2> or SN1 reactions.

Canadian Journal of Chemistry published new progress about Alkyl aryl ethers Role: SPN (Synthetic Preparation), PREP (Preparation). 22483-09-6 belongs to class alcohols-buliding-blocks, name is 2,2-Dimethoxyethanamine, and the molecular formula is C4H11NO2, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Carbonnier, Maxime published the artcileAn experimental and modeling study of the oxidation of 3-pentanol at high pressure, Safety of 3-Pentanol, the main research area is pentanol oxidation high pressure.

High pressure oxidation of 3-pentanol is investigated in a jet-stirred reactor and in a shock tube. Experiments in the reactor were carried out at 10 atm, between 730 and 1180 K, for equivalence ratios of 0.35, 0.5, 1, 2, 4 and 1000 ppm fuel, at a constant residence time of 0.7 s. Reactant, product and intermediate species mole fractions were recorded using Fourier transform IR spectroscopy (FTIR) and gas chromatog. (GC). Ignition delay times were measured for 3-pentanol/O2 mixtures in argon in a shock tube at 20 and 40 bar, in a temperature range of 1000-1470 K and for equivalence ratios of 0.5, 1 and 2. The fuel did not show any low-temperature reactivity under these conditions in neither exptl. set-up and produced various aldehydes and ketones as well as the olefin 2-pentene as intermediates. A kinetic sub-mechanism is developed in order to represent the present data and analyze the reaction pathways.

Proceedings of the Combustion Institute published new progress about Aldehydes Role: TEM (Technical or Engineered Material Use), USES (Uses). 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Safety of 3-Pentanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts