[摘要]：2-Nonen-7-ynedioic or 2-decen-8-ynedioic acid derivs. were treated with an iron reagent generated from FeCl2 and t-BuMgCl in a ratio of 1:4 to give cyclized products after hydrolysis, deuteriolysis, or the addn. of carbonyl compds. Upon reaction with the same iron reagent, 2,7-nonadienedioates afforded bicyclic ketoesters (and their enol forms) after the addn. of s-BuOH or carbonyl compds.
