presence of a catalytic amount of a rhenium or manganese complex gives ring‐expanded and carbon‐chain extension products, respectively. In these reactions, alkynes insert into a non‐strained carbon–carbon single bond of 1,3‐dicarbonyl compounds. The ring‐expansion reaction is also promoted by the addition of 4‐Å molecular sieves instead of a catalytic amount of an isocyanide.
在催化量的or或
锰配合物存在下,用环状和无环的1,3-二羰基化合物处理
炔烃,分别得到扩环和扩碳产物。在这些反应中,
炔烃插入1,3-二羰基化合物的非应变碳-碳单键中。通过添加4Å
分子筛代替催化量的异
氰化物也可以促进环扩环反应。