Carbofunctional sulfur and carboxylate bridged tin compounds

A sulfur containing organotin compound having the formula (1):

• ##EQU39## where R is a monovalent alkyl radical of 1 to 8 carbon atoms, A is ##EQU40## halogen of atomic weight 35 to 127, ##EQU41## the A groups are the same or different, with the proviso that at least one ##EQU42## is in the molecule, d is 0 or 1, each R' when d is 0 is alkylene of 1 to 10 carbon atoms;
• each R' when d is 1 is alkylene of 2 to 10 carbon atoms, each R" is hydrogen, alkyl of 1 to 20 carbon atoms, ethylenically unsaturated aliphatic hydrocarbyl having 1 to 3 ethylenic double bonds and 2 to 19 carbon atoms, halo or hydroxy alkyl of 2 to 19 carbon atoms, halo or hydroxy alkenyl of 2 to 19, cycloalkyl of 5 to 6 carbon atoms, benzyl, phenyl, alkylphenyl, halophenyl, ##EQU43## where R'" is alkylene of 2 to 10 carbon atoms, R"" is alkyl of 1 to 20 carbon atoms, alkenyl of 2 to 18 carbon atoms, halo or hydroxy alkyl of 2 to 20 carbon atoms, halo or hydroxy alkenyl of 2 to 20 carbon atoms, cycloalkyl of 5 to 6 carbon atoms, benzyl, phenyl or halophenyl, x is 1 or 2, y is 1 or 2 and z is 1 or 2, the total of x+y+z is 4, ##EQU44## where R.sub.4 is arylene, --CH=CH--, alkylene of 2 to 10 carbon atoms, R.sub.5 is nothing, alkylene of 1 to 8 carbon atoms, phenylene or --CH=CH--, R.sub.6 is alkylene of 1 to 10 carbon atoms, --CH=CH-- or arylene, R.sub.9 is a residue of a dicarboxylic acid from which the two carboxyl groups have been removed, R.sub.10 is arylene or ##SPC5##
• where t is 0 to 1
• and R.sub.11 and R.sub.12 are H or alkyl, or (2) an overbased compound prepared by reacting a dialkyltin oxide of alkylstannoic acid with a compound of the formula:
• ##EQU45##