نتایج جستجو برای: alcohols and phenols

تعداد نتایج: 16830469  

Hassan Tajik, Khodabakhsh Niknam Somayeh Karimian

In this research, different alcohols and phenols are subjected to the reaction with HMDS in the presence of ionic liquid and silica-supported catalysts. Silylation was accomplished under mild reaction conditions at room temperature in short reaction times and good to excellent yields.

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 2004
Wanda Krystyna Maczka Agnieszka Mironowicz

In biotransformations carried out under similar conditions enzymatic systems from carrot (Daucus carota L.), celeriac (Apium graveolens L. var. rapaceum) and horse-radish (Armoracia lapathifolia Gilib.) hydrolyzed the ester bonds of acetates of phenols or alicyclic alcohols. Nevertheless, methyl esters of aromatic acids did not undergo hydrolysis. Alcohols were oxidized to ketones in a reversib...

Journal: :Chemical communications 2003
Asit K Chakraborti Rajesh Gulhane

Perchloric acid adsorbed on silica gel efficiently catalyses acetylation of structurally diverse phenols, alcohols, thiols, and amines under solvent free conditions.

Hassan Tajik, Khodabakhsh Niknam Somayeh Karimian

In this research, different alcohols and phenols are subjected to the reaction with HMDS in the presence of ionic liquid and silica-supported catalysts. Silylation was accomplished under mild reaction conditions at room temperature in short reaction times and good to excellent yields.

Journal: :Organic & biomolecular chemistry 2014
Hui-Jing Li Ying-Ying Wu Qin-Xi Wu Rui Wang Chun-Yang Dai Zhi-Lun Shen Cheng-Long Xie Yan-Chao Wu

Water-promoted ortho-selective monohydroxymethylation of phenols in the NaBO2 system generates salicyl alcohols in 65-97% yields. A remarkable rate-enhancement by water was observed, and NaBO2 appeared to serve the dual role of a suitable base and an efficient chelating reagent. This protocol possesses many advantages such as short reaction times, expanded substrate scope, and high mono- and re...

2013
Eloi Coutant Paul C Young Graeme Barker Ai-Lan Lee

A gold(I)-catalysed reaction of allylic alcohols and phenols produces chromans regioselectively via a one-pot Friedel-Crafts allylation/intramolecular hydroalkoxylation sequence. The reaction is mild, practical and tolerant of a wide variety of substituents on the phenol.

Journal: :The Journal of organic chemistry 2003
Salvatore D Lepore Yuanjun He

A vast rate increase in the Mitsunobu reaction of phenols with alcohols where either or both are sterically hindered has been achieved by the use of high concentration combined with sonication.

2002

Although alcohols (including phenols such as tyrosine and the alcohol groups in serine, threonine, sterols and carbohydrates) are abundant in biomolecules, their chemical reactivity in aqueous solution is extremely low. Few reagents are selective for alcohols in aqueous solution, especially in the presence of more reactive nucleophiles such as thiols and amines. It is therefore difficult to sel...

Journal: :Chemical communications 2005
Xiaogen Huang Cotinica Craita Loay Awad Pierre Vogel

Alcohols, phenols and carboxylic acids are silylated with very good yields in the presence of silyl methallylsulfinates under non-basic conditions and with the formation of volatile co-products.

2013
Dominik Pfaff Gregor Nemecek Joachim Podlech

Carbonitriles and alcohols react in a Lewis acid-promoted Pinner reaction to carboxylic esters. Best results are obtained with two equivalents of trimethylsilyl triflate as Lewis acid. Good yields are achieved with primary alcohols and aliphatic or benzylic carbonitriles, but the straightforward synthesis of acrylates and benzoates starting with acrylonitrile and benzonitrile, respectively, is ...

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