M. Keller, H. V. Seggern, C. Wöhrle
1995
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Journal
Zeitschrift Fur Kristallographie
Abstract
The crystal and molecular structures of (endo, anti)-5-ethylidene-1,2,3,3,6,7-hexamethyl-6-(4-methoxyphenyl)-bicyclo[2.2.1]hept-2-ene (C 22 H 30 O) (DA-1) and (endo, anti)-1,3,4,5,6,7-hexamethyl-3-(4-methoxyphenyl)-bicydo[2.2.1]hept-5-en-2-one (C 20 H 26 O 2 ) (DA-2) have been resolved by X-ray diffraction methods. DA-1 crystallizes in the monoclinic space group P2 1 /a with a = 13.189(1)A. b = 8.4285(2), c = 18.033(2)A and β = 109.155°(5) A. Z = 4. DA-2 crystallizes in the orthorhombic space group Pbca with a = 11.546(1)A, b = 16.750(1) A and c = 17.986 A. Z = 8. The structures were solved by direct methods and refined by least-square procedures to final R-values of 0.054 (DA-1) and 0.046 (DA-2) for 3244 (DA-1) and 1784 (DA-2) unique observed reflections with I ≥ 2(I).