The absolute configuration and circular dichroism of (+)-(1,5)-diamino-triptycene

The absolute configuration of(+)-(1,5)-diamino-triptycene has been determined by calculation of the CD spectrum of the molecule and comparison with the experimental results of Tanaka et al.⁴ To achieve this the exciton theory of Weigang and Nugent³ has been extended to include terms representing the retardation of the electro-magnetic wave in the chromophores. The final results of the present study are in contradiction with those of Tanaka et al.^4a,b,c