n and p is an integer which cannot exceed the number of hydrogen atoms of the completely hydrogenated hydrocarbyl moiety; iii) --ROR8 wherein R is C1 -C6 hydrocarbyl and R8 is C1 -C4 alkyl; ##STR22## wherein R is C1 -C6 hydrocarbyl and R9 and R10 are each independently hydrogen or C1 -C4 alkyl; v) --R--CO2 R11 wherein R is C1 -C6 hydrocarbyl and R11 is C1 -C4 alkyl; ##STR23## wherein R12 and R13 a