Process for the preparation of heterocyclic styryl compounds and reaction products.

摘要

Heterocyclic compounds having the formula <CHEM> where R is hydrogen, methyl or ethyl R1 independently in each occurrence is hydrogen alkyl group of 1-4 carbons, and C(R):CH-Q n is a number having an average value from 0 to 5 Q has the formula <CHEM> Z is = 0, = S, or = N-R2 R is selected from hydrogen, alkyl, aryl, alkaryl, and aralkyl <CHEM> is a monocyclic or bicyclic heterocyclic ring selected from the group consisting of pyridine, pyrazine, pyridazine, pyrimidine, quinoline isoquinoline, quinoxaline, quinazoline and phthalazine x is 1 to 3 with the proviso that when n is zero, the heterocyclic ring has at least two -C(R):CH-Q groups are prepared by condensing nitrogen heterocyclic compounds such as trimethyl pyridine with dialdehyde and heterocyclic aldehydes such as furfural. These can be further reacted and chain extended with bismaleimides or polymaleimides. The compounds and their reaction products are useful to make heat resistant composites with various fibers such as graphite fibers.