Silylierungs‐ und Desilylierungs‐Experimente mit sterisch gehinderten Stannylphosphanen

Silylating and Desilylating Experiments with Sterically Hindered Stannyl Phosphanes MeP(SiMe 3 ) 2 reacts with tBu 2 Cl 2 to give the four‐membered ring (tBu 2 SnPMe) 2 ( 1 ). Mixed silyl‐stannyl‐substituted phosphanes tBu 3 SnP(SiMe 3 ) 2 ( 2 ) and tBu 2 Sn[P(SiMe 3 ) 2 ] 2 ( 3 ) are obtained by metathesis of LiP(SiMe 3 ) 2 with tBu 3 SnCl and tBu 2 SnCl 2 , respectively. Methanolysis of 2 and 3 yields the corresponding PH compounds tBu 3 SnPH 2 ( 4 ) and tBu 2 Sn(PH 2 ) 2 ( 5 ). On heating of 5 , the four‐membered ring (tBu 2 SnPH) 2 ( 6 ) is formed by a condensation reaction. The new compounds are characterized by NMR ( 1 H, 31 P, 119 Sn) and mass spectroscopy.