4,4-dihalohexahydrophthalic anhydrides and 4-...

Details 4,4-dihalohexahydrophthalic anhydrides and 4-... 4,4-dihalohexahydrophthalic anhydrides and 4-...

C - Chemistry, Metallurgy

07

C

260/364.5, 260/5

C07C 61/15 (2006.01) C07D 307/89 (2006.01)

Patent

CA 1235421

ABSTRACT 4,4-Dihalohexahydrophthalic anhydrides of the formula: Image where Y is chlorine or fluorine, are prepared by the reaction of hydrogen fluoride with 4-chlorotetrahydro- phthalic anhydride; the dihalo- anhydrides can be de- hydrohalogenated by reaction with basic alumina to pre- pare a mixture of 4-fluorotetrahydrophthalic anhydride isomers of the formula: Image the 4-fluorotetrahydrophthalic anhydrides can then be dehydrogenated by reaction with a dehydrogenation cata- lyst to prepare 4-fluorophthalic anhydride; thus the anhydrides are useful as chemical intermediates for the synthesis of 4-fluorophthalic anhydride which in turn is useful in the preparation of aromatic ether and thio- ether anhydride curing agents, antioxidants and poly- etherimide polymers.

453959

Affiliated with

Also associated with

Rating

4,4-dihalohexahydrophthalic anhydrides and 4-... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with 4,4-dihalohexahydrophthalic anhydrides and 4-..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 4,4-dihalohexahydrophthalic anhydrides and 4-... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1240170