The reactions of hexabutylditin with triphenyl phosphine and arsine have been studied in the molar ratios of 1:2.The reactions were found to be slow. Complexes of the type [R3Sn]2.2LPhj(where R= -C4H9 and L=P or As) were isolated. It has been observed that tin-tin bond was not cleaved in these reactions. Two molecules of the triphenyl phosphine or arsine form adducts.

The resulting adducts have been isolated in the form of yellow solid or liquid. They are soluble in common organic solvents and are sensitive to atmospheric moisture. These adducts probably attain a coordination number of five with trigonal bipyramidal structure.