Results 321 to 330 of about 16,649 (384)

Efficiency of hypericum perforatum, povidone iodine, tincture benzoin and tretinoin on wound healing.

Food and Chemical Toxicology, 2022
Esin Yalçınkaya, M. Basaran, M. E. Tunçkaşık, Gulce Naz Saraca, Ç. Elmas, S. Kocaturk   +5 more
semanticscholar   +1 more source

Influence of solvents on the conformation of benzoin

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2010
The conformation of benzoin in several organic solvents is investigated by infrared spectrometry and dipolometry. The frequencies, intensities, and band shapes of the nu(OH), nu(C=O), and aromatic ring vibrations indicate that in solvents of low proton acceptor ability, the cis conformer with intramolecular OH...O hydrogen bonding is preserved.
Bogusława Czarnik-Matusewicz, Z. Pawelka, Th. Zeegers-Huyskens   +2 more
openaire   +3 more sources

Solubility of Benzoin in Six Monosolvents and in Some Binary Solvent Mixtures at Various Temperatures

, 2017
The solubility of benzoin in monosolvents (acetone, ethyl acetate, methanol, ethanol, 1-propanol, and 1-butanol) and binary solvent mixtures (ethyl acetate + methanol, ethyl acetate + ethanol) was measured using UV–vis spectroscopy at temperatures ...
Yang Yang, Weiwei Tang, Xiaona Li, Dandan Han, Yumin Liu, Shichao Du, Teng Zhang, Shiyuan Liu, J. Gong   +8 more
semanticscholar   +1 more source

A DFT study on NHC-catalyzed intramolecular aldehyde-ketone crossed-benzoin reaction: mechanism, regioselectivity, stereoselectivity, and role of NHC.

Organic and biomolecular chemistry, 2016
A systematic theoretical study has been carried out to understand the mechanism and stereoselectivity of N-heterocyclic carbene (NHC)-catalyzed intramolecular crossed-benzoin reaction of enolizable keto-aldehyde using density functional theory (DFT ...
Wei Zhang, Yang Wang, D. Wei, M. Tang, Xinju Zhu   +4 more
semanticscholar   +1 more source

Fungal deracemization of benzoin

Tetrahedron Letters, 2002
An enzyme system of Rhizopus oryzae (ATCC 9363) catalyzes the inversion of the chirality of benzoin via a deracemization reaction and, depending on the pH of the medium, both enantiomers of benzoin are obtained in good yield and high ee starting from rac-benzoin.
Haluk Hamamci, Doga Capanoglu, Ayhan S. Demir, Rahsan Neslihanoglu, Beril Asikoglu, Ozge Sesenoglu   +5 more
openaire   +2 more sources

Can the Radical Channel Contribute to the Catalytic Cycle of N-Heterocyclic Carbene in Benzoin Condensation?

Journal of Organic Chemistry, 2018
NHC can catalyze benzoin condensation via the key Breslow intermediate. EPR spectroscopy recently confirmed the existence of the radical species, but its catalytic role is still unclear.
Ming-Hsiu Hsieh, Gou-Tao Huang, Jen-Shiang K. Yu   +2 more
semanticscholar   +1 more source

Solubility Modeling and Mixing Properties for Benzoin in Different Monosolvents and Solvent Mixtures at the Temperature Range from 273.15 to 313.15 K

, 2018
In the present work, the benzoin solubility in ethanol, methanol, n-propanol, isopropyl alcohol, n-butanol, acetone, ethyl acetate, acetonitrile, cyclohexane, butyl acetate, isobutyl alcohol, and toluene and ethyl acetate + ethanol solvent mixtures was ...
Yanqing Zhu, Chao Cheng, Gaoquan Chen, Hongkun Zhao   +3 more
semanticscholar   +1 more source

Solvent-Free Benzoin and Stetter Reactions with a Small Amount of NHC Catalyst in the Liquid or Semisolid State.

Organic Letters, 2016
The intermolecular or intramolecular asymmetric benzoin reaction was catalyzed by a small amount of N-heterocyclic carbene (NHC) (0.2-1 mol %) under solvent-free conditions.
T. Ema, Yoshiko Nanjo, Shonosuke Shiratori, Y. Terao, R. Kimura   +4 more
semanticscholar   +1 more source

Visible-light-enabled aerobic synthesis of benzoin bis-ethers from alkynes and alcohols

, 2018
A new, facile, atom-economical and good regioselective method for the synthesis of benzoin bis-ethers has been developed via directly using readily available alkynes and alcohols as raw materials under visible light irradiation.
Wen-Long Lei, Biao Yang, Qing-Bao Zhang, Pan-Feng Yuan, Lizhu Wu, Qiang Liu   +5 more
semanticscholar   +1 more source

Regio- and Stereoselective Aliphatic-Aromatic Cross-Benzoin Reaction: Enzymatic Divergent Catalysis.

Chemistry, 2016
The catalytic asymmetric synthesis of chiral 2-hydroxy ketones by using different thiamine diphosphate dependent enzymes, namely benzaldehyde lyase from Pseudomonas fluorescens (PfBAL), a variant of benzoylformate decarboxylase from Pseudomonas putida ...
M. Beigi, Ekaterina V. Gauchenova, Lydia S. Walter, Simon Waltzer, Fabrizio Bonina, Thomas Stillger, D. Rother, M. Pohl, Michael Müller   +8 more
semanticscholar   +1 more source