作者:Maria J. Milewska、Maria Gdaniec、Hanna Małuszyńska、Tadeusz Połoński
DOI:10.1016/s0957-4166(98)00293-6
日期:1998.9
Several chiral bicyclic dithioimides were prepared by thionation of the parent imides with Lawesson's reagent. Due to a flexibility of the dithioimide chromophore, their CD spectra show significant solvent dependence. A substantial deviation of the chromophore from planarity was confirmed by the MNDO calculations and crystallographic structures of 4, 5b, 6 and 7. The observed CE sign corresponding to the lowest energy n-pi* transition can be predicted, upon careful examination of the molecular geometry, by the antioctant rule with sector signs opposite to those known for ketones. (C) 1998 Elsevier Science Ltd. All rights reserved.