,6-DICHLOROPHENYL)BIS(2,4,6-TRICHLOROPHENYL)METHYL RADICAL - SYNTHESIS, MAGNETIC-BEHAVIOR AND CRYSTAL-STRUCTURE

,6-Dichlorophenyl)bis(2,4,6-trichlorophenyl)methyl radical (2) has bee n prepared through a reaction sequence of five stages obtaining four n ew intermediate compounds 1-4. Assignment of the structures of these c ompounds have been completely ascertained by means of their H-1 NMR sp ectra. The new persistent radical 2 has been characterized by EPR spec tra and magnetic susceptibility measurements. The X-ray structural ana lysis of 2 shows that it adopts a propeller-like conformation with the phenyl rings twisted around their bonds to trivalent carbon. Magnetic susceptibility of 2 is characteristic of a paramagnet with a weak ant iferromagnetic interaction at low temperatures (Weiss constant, theta = -1.8 K). Copyright (C) 1996 Elsevier Science Ltd