In the presence of a catalytic amount of 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), acetals are readily hydrolysed to the corresponding aldehydes or ketones in aqueous acetonitrile under neutral conditions.
Asymmetric hydroformylation catalyzed by homogeneous and polymer-supported platinum complexes containing chiral phosphine ligands
作者:Giovanni Parrinello、J. K. Stille
DOI:10.1021/ja00257a036
日期:1987.11
Hydroformylation de styrene, isobutyl-4styrene, vinyl-2 et methoxy-6 vinyl-2-naphtalenes, acetate de vinyle, methacrylate de methyle, norbornene, en presence de chlorure stanneux et en presence d'orthoformiate de triethyle
Tetrafluoroboric Acid Adsorbed on Silica Gel as a Reusable Heterogeneous Dual-Purpose Catalyst for Conversion of Aldehydes/Ketones into Acetals/Ketals and Back Again
作者:Asit Chakraborti、Dinesh Kumar、Raj Kumar
DOI:10.1055/s-2008-1042940
日期:2008.4
hydes/ketones are regenerated from the corresponding acetals/ ketals in high yields by the treatment with water-alcohol in the pres- ence of HBF4-SiO2 at room temperature for short times. Excellent selectivity was observed during inter- and intramolecular competi- tion studies involving carbonyl substrates with varying electronic and steric environments. Selective acetalformation of benzalde- hyde takes
Acetals are obtained in good to excellent yields by treatment of aldehydes and ketones with trialkyl orthoformate and the corresponding alcohol in the presence of a catalytic amount of lithium tetrafluoroborate. Due to the mild reaction conditions, this method is compatible with acid-sensitive substrates.
Copper(II) tetrafluoroborate as a novel and highly efficient catalyst for acetal formation
作者:Raj Kumar、Asit K. Chakraborti
DOI:10.1016/j.tetlet.2005.09.168
日期:2005.11
Commercially available copper(II) tetrafluoroborate hydrate has been found to be a highly efficient catalyst for dimethyl/diethyl acetal formation in high yields from aldehydes and ketones by reaction with trimethyl/triethyl orthoformate at room temperature and in short period. Acetalisation was carried out under solvent-free conditions with electrophilic aldehydes/ketones. For weakly electrophilic