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Di-n-butyltin dimethylphosphinate has been synthesized by the reaction of (n-Bu) 2 Sn(OCOCH 3 ) 2  with HO 2 PMe 2  in benzene. The ractions of (n-Bu) 2 Sn(OCOCH 3 ) 2  with MePhPOCl and Ph 2 POCl in toluene have been used to prepare (n-Bu) 2 Sn(O 2 PMePh) 2  and (n-Bu) 2 Sn(O 2 PPh 2 ) 2  respectively. On the basis of vibrational spectra and physical properties it is conclu ded that the title compounds are polymerized and the ligands function as O-P-O bridges between the tin atoms. The n-butyl groups are in trans position in the resulting octahedral environment around tin. Loss of n-butyl radicals and of the diorganophosphinate group from tin represent the main fragmentation processes in the El mass spectra of (n-Bu) 2 Sn(O 2 PRR′) 2 (RR′=Me 2 , MePh, Ph 2 ). The mass spectra show Sn(O 2 PRR′) +  as the base peak.

Synthesis and Vibrational and Mass Spectra of (n-Bu) 2 Sn(O 2 PMe 2 ) 2 , (n-Bu) 2 Sn(O 2 PMePh) 2 and (n-Bu) 2 Sn(O 2 PPh 2 ) 2