MONONUCLEAR AND BINUCLEAR TRICARBONYLCHROMIUM COMPLEXES OF ARYL-SUBSTITUTED [2.2]PARACYCLOPHANES

The complexation reactions of monoaryl- and diaryl-substituted [2.2]pa racyclophanes with (NH3)(3)Cr(CO)(3) have been studied. The aromatic r ings of [2.2]paracyclophane are more favorable for coordination than a ryl substituents. This leads to the regioselective formation of the co rresponding mono- or binuclear tricarbonylchromium complexes. In some cases, the tricarbonylchromium group is coordinated to the aryl ring o f the substituent to form (in low yields) the corresponding mononuclea r complex or binuclear complexes with both the aromatic ring of paracy clophane and the aryl ring of the substituent involved in coordination . The structure of such complex, namely, )-[2.2]paracyclophane]bis[tri carbonylchromium(0)], was confirmed by X-ray diffraction study.