Montmorillonite K-10 Clay as an Efficient Solid Catalyst for Chemoselective Protection of Carbonyl Compounds as Oxathiolanes with 2-Mercaptoethanol
作者:Nabin C. Barua、Siddhartha Gogoi、Jagat C. Borah
DOI:10.1055/s-2004-829054
日期:——
Montmorillonite K-10 clay has been found to be a mild and efficient solidcatalyst for the protection of a variety of carbonylcompounds, such as oxathiolanes, with 2-mercaptoethanol in good to excellent yields. In addition, by using this catalyst, high chemoselective protection of aldehydes in presence of ketones has been achieved.
The complex [(dppb)Pt(µ-OH)]2(BF4)2 displays high catalytic activity in the thioacetalization of a variety of aldehydes and ketones with mercaptoethanol under very mild conditions. The reaction rate is greatly enhanced by the addition to the reaction mixture of magnesium perchlorate as drying agent and molar turnovers as high as 9700 can be observed. The effect of different desiccating agents is also
Introducing catalytic activity in helical nanostructures: microwave assisted oxathioacetalisation catalysed by Al-containing helical mesoporous silicas
作者:Adela I. Carrillo、Elena Serrano、Rafael Luque、Javier García Matínez
DOI:10.1039/c0cc00030b
日期:——
Al-containing helical mesoporous silicas have been synthesized and characterised by different techniques, showing outstanding activities (comparable to those obtained with sulfuric acid) in the oxathioacetalization of cyclohexane.