Macrocyclic bis(thioureas) derived from 2,2′-biphenyl and binaphthyl skeletons have been synthesized by reaction of 2,2′-diaminobiaryl and 2,2′-bis(isothiocyanato)biaryl derivatives. The splitting of these bis(thioureas) into two units of the respective cyclic monothioureas has been monitored by NMR, shedding some light on the factors that control these processes. Additionally, a computational study
The first example of the preparation of enantiomerically pure atropisomeric mustard oils is described. Both enantiomers were obtained by simple acylation of the corresponding diamines with thiophosgene. (C) 1997 Elsevier Science Ltd.