CIRCULAR-DICHROISM OF TRANSITION-METAL COMPLEXES AND SUGAR-DERIVATIVES HAVING A FREE 1,3-DIOL SYSTEM OR ISOLATED HYDROXYL GROUP

Heptofuranose derivatives 1-6 having free 1,3-diol systems form in sit u complexes with Mo2(OAc)4 whose CD spectra permit the assignment of a bsolute configuration at C-5 using a sector rule proposed by G. Snatzk e.2-6 The interpretation of CD spectra of analogous complexes formed f rom derivatives 7-12 was more complicated and did not lead to direct c onfigurational conclusions. CD spectra of complexes formed from Rh2(CF 3COO)4 and sugar derivatives 13-21, containing an ''isolated'' hydroxy l group, permit the assignment of absolute configuration. Conclusions were corroborated by the investigation of CD spectra of rhodium comple xes with compounds 22-27.