Di-n-butyltin dimethylphosphinate has been synthesized by the reaction of (n-Bu)2Sn(OCOCH3)2 with HO2PMe2 in benzene. The ractions of (n-Bu)2Sn(OCOCH3)2 with MePhPOCl and Ph2POCl in toluene have been used to prepare (n-Bu)2Sn(O2PMePh)2 and (n-Bu)2Sn(O2PPh2)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)2Sn(O2PRR′)2(RR′=Me2, MePh, Ph2). The mass spectra show Sn(O2PRR′)+ as the base peak.
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