SYNTHESIS OF N-VINYLPYRROLIDONE DERIVATIVES ON THE BASIS OF CHLOROANHYDRIDE OF 6-CHLORO-BICYCLO[2.2.2] HEPTANE-EXO-2-METHYL-ENDO-2-CARBOXYLIC ACID AND g -, d -LACTONES OF DIMETILSUBSTITUTED CYCLOHEXANE CARBOXYLIC ACID