CONTRIBUTIONS TO THE CHEMISTRY OF PHOSPHORUS .221. STANNYL-SUBSTITUTED BICYCLO[1.1.0]TETRAPHOSPHANES - FORMATION AND PROPERTIES OF R3SN(H)P4 (R = CH3, C6H5, C-C6H11, O-C7H7)

The unsymmetrically substituted bicyclo [1.1.0]tetraphosphanes Me3Sn(H)P4 (1), Ph3Sn(H)P4 (2), (c-Hex)3Sn(H)P4 (3) and (o-Tol),Sn(H)P4 (4) have been obtained by reaction of a solution of (Na/K)HP4 with R3SnCl (R = Me, Ph, c-Hex, o-Tol) under proper conditions. The structure of the compounds 1-4, which are only stable in solution, has been elucidated by means of P-31-NMR-spectroscopy. Whereas 3 exists at -60-degrees-C as the exo,endo isomer, 1, 2 and 4 are fluctuating molecules at room temperature and probably invert between the three possible configurational isomers (exo,exo-, exo,endo-and endo,endo-form).