Alkylidenecarbenes from 1,1-Dihalogenoalkenes with Samarium Diiodide: Mild and Efficient Method for the Synthesis of Cyclopentenes

Article abstract of DOI:10.1016/0040-4039(94)85374-6

A new mild method for construction of cyclopentenes via 1,5-C-H insertion of alkylidenecarbenes by the reaction of 2,2-dialkyl-1,1-dihalogenoalkenes with SmI2 in benzene-hexamethylphosphoric triamide (HMPA) was developed.