Cobalt(I)-Mediated Cycloisomerization of Enynes:Mechanistic Insights

摘要

[CpCo(Co)_2] catalyzes the cycloisomerization of 1,n-enynes to afford selectively five-and six-membered ring systems in high yields.The factors governing the cyclization have been explored and we have discovered that the reaction associates two differdnt,but complementary,reactivities of the cobalt(I) complexes.By a judicious choice of the substitution of the enyne,it was also possible to isolate a cyclobutene that arises from a cobaltcyclopentene.