Jp. Djukic et al., SYNTHESIS AND REACTIVITY OF NEW CYCLOMANGANATED (ETA(6)-ARENE)TRICARBONYLCHROMIUM COMPLEXES, Organometallics, 16(4), 1997, pp. 657-667
(eta(6)-Arene)tricarbonylchromium complexes derived from N,N-dimethylb
enzylamine or from benzyl methyl thioether undergo a cyclomanganation
reaction when treated with PhCH(2)-Mn(CO)(5) in boiling heptane. The m
anganation process is selective and involves solely aromatic C-H bond
activation that yields bimetallic and trimetallic compounds, respectiv
ely, when compounds such as [(eta(6)-C(6)H(5)CH(2)R)Cr(CO)(3)] (R = N(
CH3)(2), SCH3) and the diamine [{eta(6)-C6H4-1,3-[CH2N(CH3)(2)]}Cr(CO)
(3)] are reacted. Cases of transmetalation reactions consisting of the
transfer of a Mn(CO)(4) moiety froth one aromatic ligand to another a
re observed with free aromatic ligands and with chromium pi-complexed
ligands. Two examples of bimetallic and trimetallic compounds, 3,5-(CH
3O)(2)-C6H2-CH2N(CH5)(2)]Cr(CO)(3)}(CO)(4)] (2) and (4)}(2){{eta-C6H2-
1,3[CH2N(CH3)(2)](2)}Cr(CO)(3)}] (6a), respectively, were characterize
d by X-ray diffraction analysis. Both complexes bear distorted Mn(CO)(
4) units with the ancillary amino ligand pointing away from the chromi
um.