invention provides novel silicone rtv compositions comprising 3 a stabilizing amount of scavenger for hydroxy radicals having the formula str9 where r is a substituted or unsubstituted organo group having at least two carbon atoms r 1 is a hydrolyzable leaving group selected from the group consisting of alkoxy amido amino carbamato enoxy imidato isocyanato oximato thioisocyanato and ureido r 2 and r 3 are independently selected c 1 13 monovalent substituted or unsubstituted hydrocarbon radicals r 4 is a hydrolyzable leaving group selected from the group consisting of alkoxy amido amino carbamato enoxy imidato isocyanato oximato thioisocyanato and ureido x is equal to 1 or 2 and y is equal to 0 to 3 inclusive and 4 optionally an alkoxy functional crosslinking agent of the formula str10 where r 5 is a c 1 8 aliphatic organic radical selected from alkyl radicals alkylether radicals alkylester radicals alkylketone radicals alkylcyano radicals or a c 7 13 aralkyl radical r 6 is a c 1 13 monovalent substituted or unsubstituted hydrocarbon radical and b equals 0 or 1 initially it should be noted that the novel compounds of the present invention are defined somewhat more narrowly than are the scavengers of the rtv composition the reason for such difference is that 1 1 diethoxy 2 trimethylsilyl 1 sila 2 azacyclopentane is described in 34 the journal of organic chemistry 34 vol 34 no 11 november 1969 and hence although.