The crystal and molecular structure of anti-8-tricyclo[3.2.1.0^2,4]octyl p-bromobenzenesulphonate

Abstract

The crystal structure of anti-8.tricyclo [3,2,1,O~,4] The structure was determined by Patterson and Fourier methods, and the parameters were refined by differential syntheses and least squares. The final R value is 0"093. The configuration of the cyclopropyl methylene group is exo. The bond distances are all normal, but the valency angles in the norbornane nucleus differ from the tetrahedral value; the angles in the cyclopropyl ring are all 60 °, and the angle at the bridgehead is 96.7 °. The intermolecular distances all correspond to normal van der }Vaals interactions.

Crystal structure of 8-phenyl-3,4,8-triaza-9-oxatricyclo[5,2,1,02,6]dec-3-ene

“…2. Conformation of the norbornane-type bridge-ring system is in agreement with the results of previous work such as the structure of anti-7-norbornenyl-pbromobenzoate by Macdonald & Trotter (1965), where most of the bond lengths and angles are nearly identical with those reported here. Of particular interest is the value of the bridgehead angle, C(3)-C(10)-C(9), which differs significantly from the tetrahedral value, as with similar bridged molecules.…”

Chemistry of proximal π-bond systems. Part IV. The structure of 5,6-dimethylenebicyclo[2,2,1]hept-2-ene molybdenum tricarbonyl

“…Tables of observed and calculated structure factors are available from the Depository of Unpublished Data.' ~o s t bond lengths and angles in the hydrocarbon moiety agree well with values found for various uncomplexed bicyclo[2,2,l]hept-2-ene derivatives (11)(12)(13)(14). Bond lengths are not significantly different (G3a) from standard values (15) and like the other X-ray structure determinations of such molecules (1 1-14), the bonds C(1)-C(7) (1.53 l(5) A) and C(4)-C(7) (1.531 (5) Csp3-Csp2, average = 1.522(6) A do not differ significantly from these values.…”

Crystal and Molecular Structure of (±)-7,7-(2′,2′-Dimethyl)pentamethylene-1-methyl-norbornane-2-oxime

“…Weighted least-squares mean planes are given i n Table 8. The structural parameters of (9) are compared with those of related compounds (13)(14)(15)(16)(17)(18)(19)(20) and oximes (21)(22)(23)(24)(25)(26)(27)(28)(29) in Table 9. Important inter-and intramolecular nonbonded contacts and details of the hydrogen bonding scheme are given in Table 10.…”