Hexacoordinate Complexes of Silacyclobutane: Spontaneous Ring Opening and Rearrangement

The title compounds were prepared and were
found to undergo ring opening and molecular rearrangement under mild conditions and no catalysis, forming
a carbon−carbon bond and closing a new chelate ring.
The rearrangement product depends on whether α-protons are present. Reactants and products are characterized by crystal structures.