Arene complexes of transition metals figure prominently in the field of organometallic chemistry (Collman, 1987; Watts, 1982). This, in part, is due to the rich structural, stereochemical and electronic features of arene metal bonds (Muetterties, 1982). It is also due to the ability of coordinated arenes to undergo new and highly selective reactions under mild conditions. In preparative organic chemistry, arene transformations via complexation complement classic arene chemistry such as aromatic electrophilic substitution (Collman, 1987) (Watts, 1982; Muetterties, 1982; Braun, 1985). Particularly useful in this respect are those arene complexes in which the arene is bound to electron withdrawing fragments.