3-Oxo-1-silaprop-1-enes, when generated by photochemical decomposition of α-diazo-α-silyl carbonyl compounds, cyclize to 1-oxa-2-silacyclobut-3-enes provided that the substituent at C-3 is sterically demanding; otherwise, the head-to-tail cyclodimers (1,5-dioxa-2,6-disilacyclo-octa-3,7-dienes) are obtained.
G. Mass, K. Schneider and W. Ando, J. Chem. Soc., Chem. Commun., 1988, 72 DOI: 10.1039/C39880000072
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