of dienynes was investigated using cobalt-based catalysts. Substrates without substitution on alkyne moiety were found to react under thermal activation. The use of a cobalt salt as catalyst made reactions cleaner by limiting the formation of byproducts. Cycloadditions with dienynes possessing a substituent on the alkyne pattern occurred only in presence of a cobalt catalyst which displayed a moderate
使用
钴基催化剂研究了二烯的分子内[4 + 2]环加成反应。发现在
炔烃部分上没有取代的底物在热活化下反应。
钴盐作为催化剂的使用通过限制副产物的形成使反应更清洁。仅在
钴催化剂的存在下才发生
炔烃图案上具有取代基的二烯的环加成,所述
钴催化剂根据底物图案显示出中等至良好的活性。