Preparation of tert-butyl-capped polyenes containing up to 15 double bonds
作者:Konrad Knoll、Richard R. Schrock
DOI:10.1021/ja00202a045
日期:1989.9
many as 13double bonds have been isolated by column chromatography on silica gel under dinitrogen at minus}40degree}C and characterized by sup 1}H and sup13}C NMR and UV-vis studies. The 17-ene has been observed by HPLC. Polyenes containing more than 17 double bonds are relatively unstable under the reaction and subsequent isolation conditions; those containing between 11 and 15 double bonds decompose
Direct polymerization of acetylene to give living polyenes
作者:Ruger Schlund、Richard R. Schrock、William E. Crowe
DOI:10.1021/ja00202a046
日期:1989.9
possible to prepare polyacetylene or shorter oligomers in a controlled polymerization of acetylene. There is good evidence that this should be possible under the right circumstances by using an alkylidene complex (eq 1). The authors report here the preparation of livingpolyenes of moderate length and block copolymers containing polyene sequences by this method.