Rhenium hydrazido 2-1 complexes

A general approach to rhenium hydrazido complexes is the reaction of oxo or chloro compounds with organohydrazines as has been demonstrated in an early report with the synthesis of [Re NNC(Ph)0 Cl2(PPh3)2] (310), " the molecular structure of which was solved in 1988. A detailed study on [Re(NNR)Cl2(PPh3)2] complexes with R = COPh or phthalazine shows that the course of subsequent reactions is governed both by the nature of the donor group R responsible for chelate closure and by the type of donor ligand introduced. No simple substitution chemistry has been observed for R = phthalazine. The benzoyl compound... 

Despite the fact that hydrazido(2—) complexes are in general restricted to the metals molybdenum, tungsten, and rhenium, a great variety of coordination sites (various coligands) have been realized. Four general routes have been employed to yield this class of compounds (143, 275, 317). 

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