NUCLEOPHILIC AROMATIC SUBSTITUTIONS - HYDRODEALKOXYLATION, HYDRODEHALOGENATION, AND HYDRODEAMINATION OF ALKOXY, HALOGENO, AND AMINO (ETA(6)-ARENE)TRICARBONYLCHROMIUM COMPLEXES

Hydrodealkoxylation, -dehalogenation, and -deamination, occur while li thium triethylborohydride is added to [eta(6)-alkoxy-, halogeno-, and -(dimethylamino)benzene]tricarbonylchromium complexes. In the case of (eta(6)-benzene)tricarbonylchromium, addition of deuteride to the benz ene ring gives reversibly an anionic tricarbonyl(eta(5)-cyclohexadieny l)chromium complex which can be trapped by triphenyltin chloride to yi eld the neutral binuclear complex (eta(5)-C6H6D)(CO)(3)Cr-Sn(C6H5)(3). The latter complex molecular structure has been confirmed by single-c rystal X-ray diffraction analysis. Empirical formula C27H21DCrO3Sn: tr iclinic system, space group P1, z = 2, a = 8.961(4) Angstrom, b = 10.8 53(5) Angstrom, c = 12.713(2) Angstrom, alpha = 85.15(3)degrees, beta = 86.26(2)degrees, gamma = 72.40(4)degrees, R = 0.033, Rw = 0.037 (uni t weight).