Marsh, Richard E.Schaefer, William P.Kephart, Susan E.Myers, Andrew2009-06-301993Marsh, Richard E., William P. Schaefer, Susan E. Kephart, and Andrew G. Myers. 1993. Structure of a syn aldol addition product of benzaldehyde and a prolinol-derived O-silacyclopentyl ketene N,O-acetal. Acta Crystallography Section C: Crystal Structure Communications C 49: 185-188.0108-2701http://nrs.harvard.edu/urn-3:HUL.InstRepos:3128705The compound (5S,6S,11 aS)-hexahydro-6-methyl-5-phenylspiro[1H,7H-pyrrolo[2,1-e][1,3,6,2]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 CI6--Si--C19 plane. Both of these rings appear to be disordered.en-USJournal Article10.1107/S0108270192008825