Novel reactions of arsonium ylides and substituted 2H-pyran-5-carboxylates, a new preparation for functionalised vinylcyclopropanecarboxylates and dihydrofurans

Substituted alkyl 2-pyran-5-carboxylates have been condensed with arsonium ylides to form substituted vinylcyclopropanecarboxylates and in a number of cases also vinyldihydrofurans.