Month: September 2022

Mistry, Nisha;Fletcher, Stephen P. published 《Phosphoramidite ligands based on simple 1,2-diols: synthesis, use in copper-catalyzed asymmetric additions, and achirotopic stereogenic phosphorus centres》 in 2016. The article was appeared in 《Advanced Synthesis & Catalysis》. They have made some progress in their research.Name: rel-(1R,2S)-1,2-Diphenylethane-1,2-diol The article mentions the following:

Phosphoramidite ligands are widely used in catalysis and normally constructed from large C₂-sym. diols such as BINOL or TADDOL. We report here on new ligands I (R¹ = R² = Ph , R¹-R² = (CH₂)₄; R³, R⁴ = CHMePh, CHPh₂, ⁱPr) based on a set of simple diols, 1,2-diphenyl-1,2-ethanediol, cis- and trans-1,2-cyclohexanol, that had been previously overlooked. Ligands based on (S,S)-trans-cyclohexanediol and (R,R)-(+)-1,2-diphenyl-1,2-ethanediol, in combination with both chiral and achiral amines, were tested in 3 different copper-catalyzed asym. reactions and up to 89% ee was observed A different ligand gave the best results in each reaction examined Using meso-cis-cyclohexanediol and meso-cis-diphenyl-1,2-ethanediol with a chiral non-racemic amine gave diastereomeric ligands bearing achirotopic stereogenic phosphorus atoms which were characterized with the assistance of x-ray crystallog. and variable temperature NMR studies. This work provides a new set of ligands that may be useful in some asym. reactions when phosphoramidites based on BINOL and TADDOL are ineffective. We also identify a novel stereochem. feature of phosphoramidites that may be useful in asym. catalysis and ligand design. To complete the study, the researchers used rel-(1R,2S)-1,2-Diphenylethane-1,2-diol (cas: 579-43-1) .

Desymmetrization of rel-(1R,2S)-1,2-Diphenylethane-1,2-diol(cas:579-43-1 Name: rel-(1R,2S)-1,2-Diphenylethane-1,2-diol) using chiral phosphine catalyst has been reported. Conversion of meso-hydrobenzoin to trans-stillbene oxide by treatment with an aryl sulfonyl chloride and aqueous sodium hydroxide has been reported.

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Obara, Naoyuki;Hirasawa, Shota;Tamura, Masazumi;Nakagawa, Yoshinao;Tomishige, Keiichi published 《Oxidative Cleavage of Vicinal Diols with the Combination of Platinum and Vanadium Catalysts and Molecular Oxygen》 in 2016. The article was appeared in 《ChemCatChem》. They have made some progress in their research.Related Products of 579-43-1 The article mentions the following:

The combination of Pt/C and V₂O₅ catalysts gave good performance for the oxidative cleavage of trans-1,2-cyclohexanediol into adipic acid via 2-hydroxycyclohexanone. The yield of adipic acid reached 90% in the one-pot oxidative cleavage of trans-1,2-cyclohexanediol. The yield was higher than that obtained in the oxidation of 2-hydroxycyclohexanone with V catalyst, and the higher yield was due to the low 2-hydroxycyclohexanone concentration during the one-pot oxidation of trans-1,2-cyclohexanediol. Cyclic vicinal diols having a six-membered ring and linear vicinal diols having two secondary OH groups were converted into dicarboxylic acids and two carboxylic acids, resp. The activity of the Pt catalyst decreased during the reaction, and the activity was partially restored by treating the used catalyst with H₂ at 573 K. Even without regeneration, the turnover number based on total Pt could reach ≈1000 in a long reaction with an increased amount of trans-1,2-cyclohexanediol. And rel-(1R,2S)-1,2-Diphenylethane-1,2-diol (cas: 579-43-1) was used in the research process.

rel-(1R,2S)-1,2-Diphenylethane-1,2-diol(cas: 579-43-1 Related Products of 579-43-1) has been used in the preparation of trans-methyl meso-hydrobenzoin phosphite.

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Liu, Jingxin;Wang, Hanlin;Zhang, Wenjuan;Wang, Teng;Mei, Meng;Chen, Si;Li, Jinping published 《Mechanistic insights into catalysis of in-situ iron on pyrolysis of waste printed circuit boards: Comparative study of kinetics, products, and reaction mechanism》 in 2022. The article was appeared in 《Journal of Hazardous Materials》. They have made some progress in their research.Recommanded Product: 80-46-6 The article mentions the following:

Pyrolysis is a potential recovery method for waste printed circuit boards (WPCBs), but the organic brominated products are toxic and hazardous. Iron has been used as a catalyst for debromination from pyrolysis oil, but the effects of in-situ iron on WPCBs pyrolysis is still not well understood. Herein, the pyrolysis mechanism for laminates of PCBs in the absence and presence of iron was studied via analyzing pyrolysis characteristics, kinetics, and products. According to the thermogravimetry experiments, pyrolysis of all samples could be divided into four stages, and iron accelerated the pyrolysis reaction by decreasing the activation energy as calculated using the Starink method. Volatiles released during the heating process were continuously determined by TG-FTIR-MS, and products generated at different pyrolysis temperatures were collected and characterized. The obtained results exhibited that iron promoted the generation of gaseous products and facilitated the conversion of organic bromides to inorganic bromides. Therefore, retaining iron was beneficial to energy saving and environmental protection for WPCBs pyrolysis. In addition, the decomposition mechanisms of brominated epoxy resin with and without iron were proposed. This work would contribute to the improvement and application of WPCBs pyrolysis technol.4-tert-Amylphenol (cas: 80-46-6) were involved in the experimental procedure.

4-tert-acylphenol (cas:80-46-6) contains hydroxyl group. Alcohols are among the most common organic compounds. They are used as sweeteners and in making perfumes, are valuable intermediates in the synthesis of other compounds, and are among the most abundantly produced organic chemicals in industry. Recommanded Product: 80-46-6

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Category: alcohols-buliding-blocksIn 2021, Ma, Chuan;Sanchez-Rodriguez, Daniel;Kamo, Tohru published 《A comprehensive study on the oxidative pyrolysis of epoxy resin from fiber/epoxy composites: Product characteristics and kinetics》. 《Journal of Hazardous Materials》published the findings. The article contains the following contents:

Thermal treatment has been the most feasible process to recycle valuable carbon fibers and obtain fuel and chems. from waste fiber/epoxy composites. The present work studied the oxidative pyrolysis behaviors of epoxy resin from fiber/epoxy composites using a thermogravimetric apparatus and a fixed-bed reactor, resp. The effects of various O₂ concentrations on the thermal behaviors of epoxy resin were investigated and the product characteristics were analyzed. Furthermore, a multi distributed activation energy model (multi-DAEM) was first developed to determine the oxidative pyrolysis kinetics of epoxy resin under various atmospheres. Results showed that the degradation behaviors of epoxy resin were largely altered by the O₂ concentrations High O₂ concentrations accelerated the primary decomposition of epoxy resin and shifted the oxidation of resin residue into lower temperatures High contents of methylcyclohexene and phenolic derivatives were detected in liquid products. In air atm., high yields of CO and CO₂ were generated and distributed in several stages. The kinetic anal. indicated that the multi-DAEM method can well explain the oxidative pyrolysis behaviors of epoxy resin. A min. six-reaction fitting process can perfectly simulate the oxidative pyrolysis of epoxy resin. The predictions for various O₂ concentrations were in good agreement with the exptl. tests. To complete the study, the researchers used 4-(2-Phenylpropan-2-yl)phenol (cas: 599-64-4) .

4-(2-Phenylpropan-2-yl)phenol(cas:599-64-4) is a natural product found in Panax ginseng.Category: alcohols-buliding-blocks 4-(2-Phenylpropan-2-yl)phenol is a useful reagent for preparing and characterizing aromatic polyphosphonates as high refractive index polymers.

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Safety of rel-(1R,2S)-1,2-Diphenylethane-1,2-diol《Convenient synthesis of ethylene carbonates from carbon dioxide and 1,2-diols at atmospheric pressure of carbon dioxide》 was published in 2016. The authors were Kitamura, Tsugio;Inoue, Yusuke;Maeda, Taisei;Oyamada, Juzo, and the article was included in《Synthetic Communications》. The author mentioned the following in the article:

An efficient and convenient synthesis of ethylene carbonates was achieved by the reaction of carbon dioxide with 1,2-diols in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), followed by treatment with 1-bromobutane. This DBU-promoted transformation proceeded at atm. pressure of carbon dioxide at 25°C and gave ethylene carbonates in good yields. The experimental procedure involved many compounds, such as rel-(1R,2S)-1,2-Diphenylethane-1,2-diol (cas: 579-43-1) .

Desymmetrization of rel-(1R,2S)-1,2-Diphenylethane-1,2-diol(cas:579-43-1 Safety of rel-(1R,2S)-1,2-Diphenylethane-1,2-diol) using chiral phosphine catalyst has been reported. Conversion of meso-hydrobenzoin to trans-stillbene oxide by treatment with an aryl sulfonyl chloride and aqueous sodium hydroxide has been reported.

Reference:
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Pan, Aaron;Chojnacka, Maja;Crowley, Robert III;Gottemann, Lucas;Haines, Brandon E.;Kou, Kevin G. M. published 《Synergistic Bronsted/Lewis acid catalyzed aromatic alkylation with unactivated tertiary alcohols or di-tert-butylperoxide to synthesize quaternary carbon centers》. The research results were published in《Chemical Science》 in 2022.Recommanded Product: 80-46-6 The article conveys some information:

Dual Bronsted/Lewis acid catalysis involving environmentally benign, readily accessible protic acid and iron promotes site-selective tert-butylation of electron-rich arenes using di-tert-butylperoxide. This transformation inspired the development of a synergistic Bronsted/Lewis acid catalyzed aromatic alkylation that fills a gap in the Friedel-Crafts reaction literature by employing unactivated tertiary alcs. as alkylating agents, leading to new quaternary carbon centers. Corroborated by DFT calculations, the Lewis acid serves a role in enhancing the acidity of the Bronsted acid. The use of non-allylic, non-benzylic, and non-propargylic tertiary alcs. represents an underexplored area in Friedel-Crafts reactivity. The experimental procedure involved many compounds, such as 4-tert-Amylphenol (cas: 80-46-6) .

4-tert-acylphenol (cas:80-46-6) contains hydroxyl group. Owing to the presence of the polar OH alcohols are more water-soluble than simple hydrocarbons. Methanol, ethanol, and propanol are miscible in water. Butanol, with a four-carbon chain, is moderately soluble.Recommanded Product: 80-46-6

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Alcohol – Wikipedia,
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Ceriani, Lidia;Papa, Ester;Kovarich, Simona;Boethling, Robert;Gramatica, Paola published 《Modeling ready biodegradability of fragrance materials》 in 2015. The article was appeared in 《Environmental Toxicology and Chemistry》. They have made some progress in their research.Recommanded Product: 3,7-Dimethyloctan-3-ol The article mentions the following:

Here, quant. structure activity relations were developed for predicting ready biodegradability of ∼200 heterogeneous fragrance materials. Two classification methods, classification and regression tree (CART) and k-nearest neighbors (kNN), were applied to perform the modeling. The models were validated with multiple external prediction sets, and the structural applicability domain was verified by the leverage approach. The best models had good sensitivity (internal ≥80%; external ≥68%), specificity (internal ≥80%; external 73%), and overall accuracy (≥75%). Results from the comparison with BIOWIN global models, based on group contribution method, show that specific models developed in this study perform better in prediction than BIOWIN6, in particular for the correct classification of not readily biodegradable fragrance materials. Environ Toxicol Chem 2015;9999:1-8. © 2015 SETAC. And 3,7-Dimethyloctan-3-ol (cas: 78-69-3) was used in the research process.

3,7-Dimethyloctan-3-ol(cas:78-69-3) is a fatty alcohol that is 3-octanol substituted by methyl groups at positions 3 and 7.Recommanded Product: 3,7-Dimethyloctan-3-ol Metabolite observed in cancer metabolism. It has a role as a human metabolite.

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Alcohol – Wikipedia,
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Lowe, Charles N.;Phillips, Katherine A.;Favela, Kristin A.;Yau, Alice Y.;Wambaugh, John F.;Sobus, Jon R.;Williams, Antony J.;Pfirrman, Ashley J.;Isaacs, Kristin K. published 《Chemical Characterization of Recycled Consumer Products Using Suspect Screening Analysis》 in 2021. The article was appeared in 《Environmental Science & Technology》. They have made some progress in their research.SDS of cas: 119-47-1 The article mentions the following:

Recycled materials are found in many consumer products as part of a circular economy; however, the chem. content of recycled products is generally uncharacterized. A suspect screening anal. using two-dimensional gas chromatog. time-of-flight mass spectrometry (GC x GC-TOFMS) was applied to 210 products (154 recycled, 56 virgin) across seven categories. Chems. in products were tentatively identified using a standard spectral library or confirmed using chem. standards A total of 918 probable chem. structures identified (112 of which were confirmed) in recycled materials vs. 587 (110 confirmed) in virgin materials. Identified chems. were characterized in terms of their functional use and structural class. Recycled paper products and construction materials contained greater numbers of chems. than virgin products; 733 identified chems. had greater occurrence in recycled compared to virgin materials. Products made from recycled materials contained greater numbers of fragrances, flame retardants, solvents, biocides, and dyes. The results were clustered to identify groups of chems. potentially associated with unique chem. sources, and identified chems. were prioritized for further study using high-throughput hazard and exposure information. While occurrence is not necessarily indicative of risk, these results can be used to inform the expansion of existing models or identify exposure pathways currently neglected in exposure assessments. The experimental procedure involved many compounds, such as 2,2-Methylenebis(6-tert-butyl-p-cresol) (cas: 119-47-1) .

SDS of cas: 119-47-12,2′-Methylenebis(4-methyl-6-tert-butylphenol)(CAS: 119-47-1) is a natural product found in Streptomyces and Aspergillus fumigatus .

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Lee, Seok-Hee;Seo, Huiwon;Seo, Hyeyeong;Lazari, Maria;D’Agostino, Martin;Byrd, Nick;Yoon, Kyong Sup;Lee, Hee-Seok;Park, Yooheon published 《An In vitro dimerization assay for the adverse outcome pathway approach in risk assessment of human estrogen receptor α-mediated endocrine-disrupting chemicals》. The research results were published in《Chemosphere》 in 2022.Product Details of 140-66-9 The article conveys some information:

The adverse outcome pathway (AOP) has been recently proposed as an effective framework for chem. risk assessment. The AOP framework offers the advantage of effectively integrating individual in vitro studies and in silico prediction models. Thus, the development of an effective testing method to measure key events caused by chems. is essential for chem. risk assessment through a fully developed AOP framework. We developed a human cell-based estrogen receptor α (ERα) dimerization assay using the bioluminescence resonance energy transfer (BRET) technique and evaluated the ERα dimerization activities of 72 chems. Fifty-one chems. were identified to mediate dimerization of ERα, and the BRET-based ERα dimerization assay could effectively measure the events that mediated dimerization of ERα by the estrogenic chems. These results were compared with the results of pre-existing assay to determine whether the BRET-based ERα dimerization assay could be employed as an in vitro test method to provide scientific information for explaining key events as a part of the AOP framework. Consequently, we propose that the BRET-based ERα dimerization assay is suitable for measuring the chem.-mediated dimerization of ERα, a key event in the AOP framework for cellular-level risk assessment of estrogenic chems.4-tert-Octylphenol (cas: 140-66-9) were involved in the experimental procedure.

4-tert-Octylphenol(cas: 140-66-9) is a common environmental pollutant showing weak estrogenic effects.Product Details of 140-66-9 It has been shown to cause harm to vertebrate male reproductive systems.

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Mulero, Angel;Pierantozzi, M.;Cachadina, Isidro;Di Nicola, G. published 《An Artificial Neural Network for the surface tension of alcohols》. The research results were published in《Fluid Phase Equilibria》 in 2017.Electric Literature of C11H16O The article conveys some information:

An Artificial Neural Network model is proposed for the calculation and prediction of the surface tension of alcs. A total amount of 4316 data for 147 alcs. was used for training, validating and testing the network model. After considering different architectures, the one giving better results includes an input layer that uses four independent variables (temperature, critical point temperature, critical d., and radius of gyration), two hidden layers with 21 neurons each one, and one neuron in the output layer was found to give the best results. Overall mean absolute percentage deviation of 1.04% was found, whereas models based on corresponding-states principle give mean deviations higher than 11.3%. The experimental procedure involved many compounds, such as 4-tert-Amylphenol (cas: 80-46-6) .

4-tert-acylphenol (cas:80-46-6) contains hydroxyl group. Owing to the presence of the polar OH alcohols are more water-soluble than simple hydrocarbons. Methanol, ethanol, and propanol are miscible in water. Butanol, with a four-carbon chain, is moderately soluble.Electric Literature of C11H16O

Reference:
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