Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published November 15, 1992 | Published + Supplemental Material
Journal Article Open

Structure of an anti-aldol addition product of benzaldehyde and a pseudoephedrine-derived O-silyl ketene N,O-acetal

Abstract

[4S-(4R*,5R*,8R*,9S*)]-2,2,5,6,8-Pentamethyl-4,9-diphenyl-1,3-dioxa-6-aza-2-silacyclononan-7-one, C_(22)H_(29)NO_3Si, M_r = 383.56, monoclinic, P2_1, a = 6.550 (3), b = 17.318 (6), c = 20.129 (6) Å, β = 98.83 (3)°, V = 2256.2 (14) Å^3, Z = 4, D_x = 1.13 g cm^(-3), λ(Mo Kα) = 0.71073 Å, µ = 1.18 cm^(-1), F(000) = 824, room temperature, R on F = 0.039 for 4305 reflections with F_o^2 > 3σ(F_o^2). The two independent molecules in this structure have nearly the same configuration and geometry, with average Si-C bond distances of 1.842 (3) Å and average Si-O bond distances of 1.636 (7) Å; angles at Si differ from 109.5° by an average of 3.5°. The nine-membered rings are fully extended and the planes of the phenyl groups are approximate perpendicular to the nine-membered ring.

Additional Information

© 1992 International Union of Crystallography. Received 30 September 1991; accepted 18 February 1992. Generous financial support from the National Science Foundation is gratefully acknowledged.

Attached Files

Published - hh0589.pdf

Supplemental Material - hh0589.cif

Files

hh0589.pdf
Files (340.6 kB)
Name Size Download all
md5:cf8271de74f202d29f764b8101c6d578
331.5 kB Preview Download
md5:67e3162c457003c838227e58884e43d7
9.0 kB Download

Additional details

Created:
August 20, 2023
Modified:
October 24, 2023