Bonding in 1,3-Cyclodisiloxanes: 29Si NMR Coupling Constants in Disilenes and 1,3-Cyclodisiloxanes

摘要

The coupling constants J(Si-Si) for a series of unsymmetrically substituted tetraaryldisilenes (2-4) and 1,3-cyclodisiloxanes (7-9) each containing two chemically and magnetically nonequivalent silicon atoms, were measured by 29 Si NMR spectroscopy. The disiloxanes were generated by oxidation of the corresponding disilenes in benzene solution at 25 C. Values for J(Si-Si) are discussed as they related to the unique structural and bonding features in these two systems.