Amino and amido dialkyl tin carboxylates

Compounds corresponding to either of the formulae:

• ##STR21## wherein R.sub.1 and R.sub.2 are independently H, alkyl of 1 to 20 carbon atoms;
• hydroxyalkyl of 2 to 20 carbon atoms;
• or R.sub.1 and R.sub.2 together form a heterocyclic ring of 5 or 6 atoms;
• ##STR22## in which n equals zero or one and R.sub.6 is hydrogen or an alkyl or an alkyl hydrocarbyl group of up to 20 carbon atoms;
• A and B are carbon atoms linked by a single or double bond or together comprise part of a six membered ring from the group consisting of cyclohexane, cyclohexene and benzene;
• R.sub.4 and R.sub.5 are independently alkyl groups of 1 to 20 carbon atoms, phenyl or cycloalkyl groups of 6 to 20 carbon atoms.