K. R. Acharya

Structure of 1-diphenylmethyl-3-hydroxyazetidinium chloride, C16H18NO+.Cl−

M r =275.8, monoclinic, P2 1 /a, a=12.356 (5), b=9.054 (4), c= 14.043 (4) A, β=100.34 (3) °, V=1545.5 A 3 , Z=4, D m =1.14, D x = 1.185 Mg m -3 , μ (Mo Kα, λ= 0.7107 A ) 2.77 mm -1 , F(000)=584.0, T=293 K, R=0.053 for 1088 reflections. The four-membered ring is buckled 13.0° (θ=167.0°). The azetidinium moiety is linked to the C1-ion through a hydrogen bond [O-H…C1=3.166 (5) A].

X-ray structure of alloisolongifolol-p-nitrobenzoate: revision of the structure of alloisolongifolene, the parent hydrocarbon

Abstract An X-ray crystal structure analysis of alloisolongifolol- p -nitrobenzoate as 4 has necessitated a revision of the earlier assigned structure 3 to 5 for alloisolongifolene, the parent hydrocarbon.

Conformational flexibility of longifolene

The flexibility of the bicyclo[2.2.1]heptane-based tricyclic bridged system in longifolene is analysed based on x-ray structural data. In this context, the molecular structure of three differently substituted longifolenes has been analysed. The highly substituentdependent conformation provides scope for the synthesis of a variety of commercially oriented products.

A polarized twisted ethylene: (1,3-dimethyl-2-imidazolidinylidene)phenylacetonitrile, C13H15N3

M r =213.13, orthombic, P2 1 2 1 2 1 , a=9.858 (2), b=10.951 (2), c=10.984 (2) A, V=1185.8 A 3 , Z=4, D m =1.191 (2) (by flotation method in KI solution), D x =1.194 (2)g cm -3 , λ(Mo Kα)=0.7107 A, μ=0.41cm -1 , F(000)=456, T=293K. Final R=0.041 for 875 significant reflections. The C=C bond length is 1.382 (4) A, significantly longer than that in ethylene, 1.336 (2) A. The molecular is twisted about the C=C bond by 23.1 (4)° and athe phenyl group is rotated out of the plane of this bond by 39.4 (4)°. Molecular packing is determined by van der Waals forces.