Annulated bicyclo[2.2.2]octenones: 9-hydroxy-9-chloromethyl-endo-tricyclo[5.2.2.02,6]undeca-4,10-diene-3-spiro(1′-cyclopropane)-8-one and 12-hydroxy-12-chloromethyl-endo-tricyclo [8.2.2.02,9]tetradeca-13-en-11-one
作者:Mino R. Caira、Ashutosh V. Bedekar、Vishwakarma Singh
DOI:10.1007/bf01667028
日期:1995.9
A single crystal X-ray diffraction study of two annulated bicyclo[2.2.2]octenones has been carried out to establish their precise stereostructures. The compounds, with their crystal data, are: 1, 9-hydroxy-9-chloromethyl-endo-tricyclo[5.2.2.0(2,6)]undeca-4,10-diene-3-spiro(1'-cyclopropane)-8-one, C14H15O2Cl, space group P2(1)/c, a = 10.540(2), b = 9.668(1), c = 11.841(4)Angstrom, beta = 95.67(2)degrees, Z = 4, and 3 12-hydroxy-12-chloromethyl-endotricyclo[8.2.2.0(2,9)]tetradeca- -13-en-11-one, C15H21O2Cl, space group C2/c, a = 20.747(8), b = 6.498(1), c = 20.525(3)Angstrom, beta = 93.04(3)degrees, Z = 8. The molecule of 1 has endo stereochemistry at the ring junction and the spirocyclopropane ring is proximal to the hydroxyl group. In 2, the eight membered ring deviates from a chair conformation and one ring atom is disordered. Crystals of 1 and 2 contain centrosymmetric dimers formed by C=O ... O-H hydrogen bonds.