wherein R R and R are each a C hydrocarbon radical and n is an integer from to 1; (11) compounds of the formula wherein R R and R are each a member of the group consisting of a hydrogen atom and a C hydrocarbon radical and n is an integer from 0 to 1; (0) compounds of the formula wherein X is a halogen atom, and n is an integer from 0 to 1; (p) compounds of the formula SO X wherein X is a halogen