Triphenylene compounds and preparation of discotic liquid crystalline crosslinked polymers

A compound of the formula (I) ##STR12## where R.sup.1 to R.sup.12 are identical or different and are each hydrogen, halogen, alkyl, X-alkyl, where X is O, S or NH, or N(alkyl).sub.2, where each alkyl radical is of 1 to 20 carbon atoms, or are each such additionally substituted alkyl radicals containing as substituents, COOH, OH, NCO, NH.sub.2, NHR.sup.13, N(R.sup.13).sub.2, or OR.sup.13, wherein R.sup.13 is a straight chain or branched alkyl, of up to 12 carbon atoms, aryl, alkaryl, oxaalkyl having up to four oxygen atoms in the chain or thiaalkyl having up to 4 sulfur atoms in the chain, or are each radicals which contain C--C double bonds, C--C triple bonds, oxiranyl groups or thiiranyl groups, with the proviso that at least three of the radicals R.sup.1 to R.sup.12 are radicals containing oxiranyl or thiiranyl groups or radicals containing C--C double bonds, of the formulae ##STR13## where Y is O, S or a single bond, Z is (CH.sub.2).sub.n and n is from 1 to 12.