Synthesis and structures of ring and cage compounds containing Si-O-As bonds

The cyclic arsenosilicate compounds (PhAsO)2(Bu2SiO)2, 7, {PhAs(O)O}2(Bu2SiO)2, 8, [OCMe2CH2C(H)MeO]AsOSiPh3, 9, and cage-structured BuSi{OAs(Ph)O}3SiBu, 10 and As(OSiBu2O)3As, 11, have been synthesised, their spectroscopic (IR and NMR) and mass spectrometric properties recorded and the solid state structures of 7, 9 and 10 established with single crystal X-ray techniques.