The present work describes an improved one pot access to alpha-(gem-difunctional) cinnamate esters and to conjugated 1,3-diketones exploiting the addition of 1,3-diketones, P-keto esters and malonates to alkynoates catalyzed by phosphines. Among the catalysts, nBu(3)P was found as one of the most effective allowing the reaction to proceed in milder conditions and in a more general manner than with other phosphines. (C) 2005 Elsevier Ltd. All rights reserved.
Disclosed is a cross-linkable aromatic polycarbonate, which is obtainable by co-polymerization of at least one aromatic diol, at least one carbon dioxide source and at least one acetylenic compound.