Two-armed silicon

Abstract

[...]insight into the chemical bonding in the two silylenes was obtained by looking at the signals (the chemical shifts) of silicon-29 nuclei in the nuclear magnetic resonance spectra for the molecules. The chemical shifts for the new silylenes provide further clear evidence that the compounds are indeed divalent silicon compounds. [...]the shifts suggest that Rekken and colleagues' silylene is partially stabilized by electron donation from the sulphur atoms adjacent to the silicon atom, and that Protchenko and colleagues' silylene may also be partially stabilized by electron donation from the atoms on either side of the silicon, but to a lesser extent.