Thermal and Photochemical Transformation of Conformational Chirality into Configurational Chirality in the Crystalline State
作者:Kenneth C. W. Chong、John R. Scheffer
DOI:10.1021/ja029182i
日期:2003.4.1
keto-acids possessing the tricyclo[4.4.1.0]undecane ring system and optically pure amines undergo Norrish type II cleavage in the solid state in enantiomeric excesses as high as 95% at 98% conversion, following removal of the ionic chiral auxiliaries. Thermal enolene rearrangement of the same salts results in optical yields approximately half those observed for the photochemical reaction.
The crystal structure of a simple enol formed in a single-crystal-to-single-crystal enolene rearrangement
作者:Kenneth CW Chong、Brian O Patrick、John R Scheffer
DOI:10.1139/v03-207
日期:2004.2.1
When crystals of 9-tricyclo[4.4.1.0]undecalyl-4-(carbomethoxy)phenyl ketone (1) were allowed to stand in the dark for extended periods of time at room temperature, the compound underwent a thermal reaction the enolene rearrangement to afford enol 2. The crystals remained transparent and appeared unchanged in shape as the reaction proceeded. X-ray diffraction data were collected on single crystals