Organotin compounds of monomethyl succinate

Di and triorganotin derivatives of mono-methyl succinate of general formula RnSn(MeO2CH2CH2COO)(4-n), where R = Me, Et and N-Bu have been prepared. On the basis of I.R. spectroscopic data the diorganotin derivatives are assig ned carboxylate bridge structure with trnas -C2SnO4 octahedral geometry, wh ile trioganotin derivatives adopt bridge structure wit a trans- C3SnO2 trig onal bipyramidal geometry at tin. Both type of derivatives dissociate into four coordinate species in solution as evidenced by NMR (H-1 and C-13) spec tral data.