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R. Caujolle, A. Lattes, J. Jaud, J. Galy

Etude structurale de deux oxazabicyclo [3.3.1.] nonanone: Mise en evidence des differences de conformation du systeme bicyclique

The two varieties of the title compound, A = C₂₈H₃₃NO₆, and B = C₃₁H₃₉NO₆, crystallize in the triclinic system space group P-1 with a = 10.605(9) Å, b = 11.85(1) Å, c = 12.19(1) Å, α = 109.2(9)°, β = 113.7(1)°, }´ = 89.35(9)° for the former and a = 10.273(1) Å, b = 11.561(8) Å, c = 12.605(8) Å, α = 101.65(8)°, β = 96.09(7)°, y = 92.82(7)°. Both structures have been determined using direct methods and refined to conventional R factors of 0.050 (A) and 0.054 (B) for 4712 and 5102 reflections, respectively. Both chair-chair and boat-chair conformations can exist. The drastic sterical effects of the substituent brought by the nitrogen atom have been emphasized.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 166, 01/1984
Pages: 081 - 095

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