2-Ethoxycarbonyl-1-silacyclobutanes were synthesized by intramolecular C–H insertion of carbenes generated photochemically from α-(di-tert-butylsilyl)-α-diazoacetates; they undergo smooth thermal ring-expansion by a 1,3(C → O) silyl shift to form 6-ethoxy-1-oxa-2-silacyclohex-5-enes.
Synthesis and ring enlargement of 2-ethoxycarbonyl-1-silacyclobutanes
G. Maas and S. Bender, Chem. Commun., 2000, 437 DOI: 10.1039/A909306K
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