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Published January 15, 1993 | Published
Journal Article Open

Structure of a syn-aldol addition product of benzaldehyde and a prolinol-derived O-silacyclopentyl ketene N,O-acetal


The compound (5S,6S,11aS)-hexahydro-6-methyl-5- phenylspiro[l H,7 H-pyrrolo[2,l-e][l,3,6,2]dioxazasilonine- 3,1'-silacyclopentan]-7-one (1) results from the silicon-directed condensation of the prolinol-derived O-silacyclopentyl ketene N,O-acetal (2) with benzaldehyde. The five-membered pyrrolidine ring has an envelope conformation and the silacyclopentyl ring has an en-type conformation with C17 and C18 on opposite sides of the C16-Si-C19 plane. Both of these rings appear to be disordered.

Additional Information

© 1993 International Union of Crystallography. Received 13 May 1992; accepted 14 August 1992. Financial support from the National Science Foundation is gratefully acknowledged. SEK acknowledges an NSF predoctoral fellowship.

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