SYNTHESIS AND STRUCTURAL STUDIES OF BRIDGEHEAD DIENES 3-OXOBICYCLODODECA-1(11),8(9)-DIENE-(ZZ)-11-CARBOXYLIC ACID AND 3-OXOBICYCLOTRIDECA-1(12),9(10)-DIENE-(ZZ)-12-CARBOXYLIC ACID

Article abstract of DOI:10.1016/S0040-4020(01)87603-1

Single crystal X-ray structures of two bridgehead dienes are reported.The bridgehead double bonds of diene 7 show only modest deviation from strain-free tetrasubstituted double bonds.The double bonds in bridgehead diene 6, however, exhibit an average deviation of the C-C=C-C torsion angle (Φ+Χ) of 14 deg.