Ta. Zyablikova et al., Structure of 1,3,2,6-dioxasilaphosphocines in solution. Experimental and theoretical studies, RUSS J G CH, 69(7), 1999, pp. 1120-1126
Steric structure of 1,3,2,6-dioxasilaphosphocines in solution is studied by
high-resolution H-1, C-13, P-31, and Se-77 NMR spectroscopy, dipole moment
and Ken effect measurements, and theoretical calculations. It is found tha
t independent on the coordination of the phosphorus atom (3 or 4) the eight
-membered hetero-ring prefers a chair-chair (crown) conformation.