4- PERFLUORO-3- 1-METHYLETHYL -4-METHYL-2-PENTENE-2-OXY PHTHALIC ANHYDRIDE AND ITS PREPARATION

摘要

NEW MATERIAL:4- [ Perfluoro-3- ( 1-methylethyl ) -4-methyl-2-pentene-2-oxy ] - phthalic anhydride of formula I. USE:A curing agent for epoxy resins. PREPARATION:The dehydration reaction of 4-[ perfluoro-3-( 1-methylethyl )-4- methyl-2-pentene-2-oxy]-phthalic acid of formula II at 190-220 deg.C gives the compound of formula I. The compound of formula II, the raw material, is obtaied by condensation of perfluoro-3-(1-methylethyl)-4-methyl-2-pentene or perfluoro-3- ethyl-2,3-diethyl-2-pentene alone or their mixture with 4-hydroxyphthalic acid.