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Poly(4-vinylpyridinium) perchlorate as an efficient solid acid catalyst for the chemoselective preparation of 1,1-diacetates from aldehydes under solvent-free conditions
Poly(4-vinylpyridinium) perchlorate Chemoselective Supported catalyst Acylation Aldehyde
2014/3/8
Poly(4-vinylpyridinium) perchlorate has been used as a supported, recyclable, environmentally-benign catalyst for the formation of acylals from aliphatic and aromatic aldehydes in good to excellent yi...
Chemoselective Oxidation of Sulfides with Ammonium Nitrate and Silica Sulfu-ric Acid Catalyzed by KBr
sulfide sulfoxide chemoselectivity ammonium nitrate potassium bromide silica sulfuric acid
2009/9/15
A convenient and selective catalytic method for the sulfoxidation of aliphatic and aromatic sulfides by treatment of NH4NO3, silica sulfuric acid, wet SiO2 (50% w/w) and a catalytic amount of KBr in C...
H2{SO}4-silica as an efficient and chemoselective catalyst for the synthesis of acylal from aldehydes under solvent-free conditions
Acylals aldehydes catalysis solvent-free reactions
2010/4/9
A variety of aldehydes react with acetic anhydride in the presence of a catalytic amount of H2SO4-silica to afford the corresponding 1,1-diacetates (acylals) in excellent yields. Ketones are not affec...
New Alkoxyzinc Salts Mediated Chemoselective Transesterification Reactions
Chemoselective transesterification zinc bromide zinc acetate alkoxyzinc bromide alkoxyzinc acetate
2010/4/19
A new chemoselective method for the transesterification of alkyl esters in the presence of in situ formed alkoxyzinc salts was developed. Electron-rich esters are less reactive than electron poor ones...