Photochemical preparation of silanes containing imide groups

A composition of matter obtained by irradiating a compound of the formula III ##STR76## or a mixture of different compounds of the formula III, in which R.sup.1 and R.sup.2 independently of one another are methyl, ethyl, phenyl, vinyl, chlorine or a group --OR, R.sup.3 is chlorine or --OR, R is alkyl having 1-10 C atoms, cycloalkyl having 5-8 C atoms or phenyl, A is a substituted or unsubstituted, divalent, saturated or unsaturated, aliphatic, cycloaliphatic, aliphatic-aromatic or aromatic radical, where the aliphatic radicals A or aliphatic moieties of aliphatic-aromatic radicals A can be interrupted by hetero-atoms, or A is a grouping ##STR77## or a grouping ##STR78## and in the two last-mentioned groupings the bond to the particular N atom is effected via the free valency in the benzene nuclei, R.sup.10 is hydrogen, methyl or ethyl, R.sup.11 is hydrogen or alkyl having 1 to 10 C atoms, d is a number from 0 to 6, c is a number from 1 to 6 and M is --O--, --NH--or --N(R.sup.11)--, and in which Y is ##STR79## R.sup.12 and R.sup.13 independently of one another are hydrogen, methyl, phenyl, --CN or halogen and R.sup.8 is alkylene having 3 or 4 C atoms, which can be branched and can be interrupted by a hetero-atom, or is one of the radicals ##STR80## in an organic solvent at temperatures between 5.degree. C. and 120.degree. C. with UV light.