Patent ID: 6342614
Filing Date: 2002-01-29
Classification: B01J,C07D

Abstract:
A process for preparation of a 2,5-dihydrofuran of the formula where each R1 is independently selected from hydrogen, alkyl of up to 8 carbon atoms, carbocyclic or heterocyclic aryl group of about 5-10 carbon atoms, or halogen, or any two R1 substituents collectively may represent an alkylene group forming a ring, by the catalytic isomerization of &ggr;, &dgr;-epoxy-alkenes or &ggr;, &dgr;-epoxycycloalkenes of the formula which comprises the isomerization being catalyzed by a system which comprises components A and C, at from 60Â°to 225Â° C., where A is an onium iodide and C is a Lewis acid.