The reaction of carbon dioxide with α-ethynyl tertiary alcohols has been catalyzed by cobaltocene to give α-methylene cyclic carbonates in good yields. α-Ethynyl primary or secondary alcohols give noncyclic alkyl carbonates in fair yields.
Effective Guanidine-Catalyzed Synthesis of Carbonate and Carbamate Derivatives from Propargyl Alcohols in Supercritical Carbon Dioxide
作者:Nicola Della Ca'、Bartolo Gabriele、Giuseppe Ruffolo、Lucia Veltri、Tito Zanetta、Mirco Costa
DOI:10.1002/adsc.201000607
日期:2011.1.10
The reactions of propargyl alcohols with carbondioxide in supercriticalcarbondioxide or in acetonitrile with gaseous carbondioxide in the presence of organic bases as catalysts have been examined. Bicyclic guanidines are effective catalysts for the formation of α‐methylene cyclic carbonates under mild reaction conditions. Oxoalkyl carbonates, oxoalkyl carbamates or α‐methyleneoxazolidinones are
Process for converting secondary and tertiary acetylenic carbinols to the corresponding alpha,beta-unsaturated carbonyl compounds by rearranging the carbinol with (trilower alkyl-, tricycloalkyl-, triaryl- or triarylalkyl-siloxy)-vanadium oxide catalyst in the presence of a silanol where either the vanadium oxide or the silanol contains a phenyl group substituted with at least one electron withdrawing group.