Some General Aspects of Arene Transition Metal Chemistry

SOME GENERAL ASPECTS OF ARENE TRANSITION METAL CHEMISTRY 

The widely applicable Fischer-Hafner method has been used to prepare arene complexes of most of the transition metals. The method involves the reaction of metal halide, aromatic hydrocarbon, aluminum trihalide, and aluminum metal, e.g. 53, 7576)(M = Cr, V), 

The cocondensation of transition metal atoms and aromatic hydrocarbon at liquid nitrogen temperature leads directly to zero-valent arene complexes (27, 288, 376). Complexes, such as (CgHg)2Ti and (CgFg)-(CgHg)Cr, that are not accessible by the Fischer-Hafner method have been prepared by this method. 

Reaction of disubstituted acetylenes with transition metal compounds often leads to arene complexes 93, 154, 245, 416, 460), e.g. (M = Mn, Co), 

The reaction may in some cases involve a metalocycle intermediate such as 44) 

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II. Some General Aspects of Arene Transition Metal Chemistry... 

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