The chemistry of the molybdenum and tungsten complexes containing bis (η-cyclopentadienyl) M (Cp
2M) fragment is described. Protonation of Cp
2MH
2 with
p-toluenesulfonic acid (TsOH) afforded isolable trihydrido cationic complexes, [Cp
2MH
3]
+TsO
-. When the reaction was carried out in the presence of ketones, aldehydes, or imines, their reductions to yield the corresponding alcohols or amines took place : the reactions with high diastereo- and moderate enantio-selectivity were achieved. The reactions of Cp
2MoH
2 with allylic alcohols in the presence of protonic acids yielded the cationic η-allyl complexes accompanied with cyclic γ-hydorxypropyl complexes. The first molybdenocene derivatives with the stable carbene, imidazole-2-ylidene or imidazolin-2-ylidene, were successfully synthesized starting from Cp
2Mo (H) OTs or [Cp2Mo (H) Li]
4. Cp
2W (H) Ph, which was prepared by irradiating Cp
2WH
2 in benzene, was reacted with RCOOH to yield either carboxylato (hydrido) -or dicarboxylato-tungsten complexes, and with CO
2 in the presence of water to give carbonato derivative. Cp
2M(OTs)
2 was converted to the di-μ-hydroxy dinuclear complex by treating it with water in acetone in the presence of Cp
2MH
2. Finally, the corresponding chemistries involving the bis (MeCp) complex in the place of Cp
2 are described.
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