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1. (WO1991003472) PROCESS FOR THE PREPARATION OF HALOGENATED 2,2-BIS(TRIFLUOROMETHYL)-1,3-DIOXOLANES

Pub. No.:    WO/1991/003472    International Application No.:    PCT/US1990/004505
Publication Date: Mar 21, 1991 International Filing Date: Aug 16, 1990
IPC: C07D 317/42
Applicants: E.I. DU PONT DE NEMOURS AND COMPANY
Inventors: MANZER, Leo, E.
RESNICK, Paul, R.
Title: PROCESS FOR THE PREPARATION OF HALOGENATED 2,2-BIS(TRIFLUOROMETHYL)-1,3-DIOXOLANES
Abstract:
A process for the production of a halogenated 2,2-bis(trihaloalkyl)-1,3-dioxolane of formula (I), wherein Rf is perhaloalkyl comprising a 2,2-bis(trihaloalkyl)-1,3-dioxolane in the presence of at least one of La, Ni, Sn, Zn, Fe, Co or Cu is disclosed. A process for the production of a halogenated 2,2-bis(trihaloalkyl)-1,3-dioxolane of formula (II), wherein X is Cl and each Y is independently Cl or F and wherein at least one Y is F, comprising fluorinating a halogenated 2,2-bis(trifluoromethyl)-4,4,5,5-tetrachloro-1,3-dioxolane in the presence of a catalyst which is preferably Cr2O3 is disclosed. A process for the production of a 2,2-bis(trihaloalkyl)-1,3-dioxole of formula (III), comprising dehalogenating substantially only a corresponding trans-2,2-bis(perhaloalkyl)-4,5-difluoro-4,5-dichloro-1,3-dioxolane is disclosed.