Preparation and structures of novel silamacrocyclic compounds: silacalix[4]quinone and silacalix[4]hydroquinone octamethyl ether.
X-ray crystallographic analysis revealed that novel silamacrocyclic compounds, 2,8,14,20-tetrasilacalix[4]quinone and 2,8,14,20-tetrasilacalix[4]hydroquinone octamethyl ether, adopted 1,3-alternate structures in the solid state.