Preparation of halo enol phostones by reaction of acetylenic phosphonate monoesters with(bis-collidine)halo hexafluorophosphate

摘要

Reaction of non-conjugated acetylenic phosphonate monoesters with(bis-collidine)bromo and iodo hexafluorophosphates was found to lead to the formation of halo enol phostones.Depending on the size of the heterocyclic compounds formed(6-8-membered compounds),endo or a mixture of endo and exo cyclization products were obtained.