The structures of ethyl 1,4,5-exo-trimethyl-7-oxo-2,3-diphenylbicyclo[2.2.1]hept-2-ene-5-endo-carboxylate (A) and ethyl 1,4-dimethyl-7-oxo-2,3-diphenylbicyclo[2.2.1]hept-2-ene-5-endo-carboxylate (B)

Balasubrahmanyam, S. N. ; Usha, R. ; Venkatesan, K. (1981) The structures of ethyl 1,4,5-exo-trimethyl-7-oxo-2,3-diphenylbicyclo[2.2.1]hept-2-ene-5-endo-carboxylate (A) and ethyl 1,4-dimethyl-7-oxo-2,3-diphenylbicyclo[2.2.1]hept-2-ene-5-endo-carboxylate (B) Acta Crystallographica - Section B: Structural Crystallography & Crystal Chemistry, 37 (3). pp. 629-634. ISSN 0567-7408

Full text not available from this repository.

Official URL: http://scripts.iucr.org/cgi-bin/paper?S05677408810...

Related URL: http://dx.doi.org/10.1107/S0567740881003713

Abstract

Crystals of C25H26O3 are triclinic, space group Pï, with a=9.197(2), b=10.357 (2), c=11.086 (3) Å, α=94.07 (2), β=98.21 (3), γ=90.82(2) °, V=1042.2 Å3, Z=2, Dobs=1.19, , Dcalc=1.198 Mg m-3 and μ (Cu Kα)=0.661 mm-1; R=6.2% for 2525 significant reflections. Crystals of C24H24O3 (B) are monoclinic, space group P21/a, with a=11.584 (2), b=11.315 (2), c=15.900 (4) Å, β=104.02 (2)°, V=2022.4 Å3, Z=4, Dobs=1.199, Dcalc=1.185 Mg m-3and μ (Cu Kα=0.081 mm-1; R=4.2% for 1990 significant reflections. The steric strain introduced by the bulky sbstituents on the norbornenone system is discussd. In addition, a possible relationshp between the orienation of the ester function and the anisochrony of O-methylene protons is brought out.

Item Type:Article
Source:Copyright of this article belongs to International Union of Crystallography.
ID Code:66683
Deposited On:27 Oct 2011 04:04
Last Modified:27 Oct 2011 04:04

Repository Staff Only: item control page