Addition to a Triple Bond Alkylidine, Nitrido

Despite early reports on the addition of hydroxyl groups to tungsten-alkylidyne bonds [5-7], recent work has showed that the triple-bond remains untouched, at least in the cases involving the reaction of [Mo(=CEt)(N BuPh)3] [13], [W(=CCMe3) (CH2Me3)3] [26, 27] and [Mo(=CCMe3)(CH2Me3)3] with silica [28]. 

The behavior of the nitrido ligand seems rather complex while the reaction of complex [Mo(=N)(CH2Me3)3] with silica leads to the well-defined species [( SiO) Mo(=NH)(=CHCMe3)(CH2CMe3)j [29, 30], protonation of the nitrido ligand is not observed in the case of [Mo(=N)(0- Bu)3] [31]. 

It seems that the simple replacement of a o-bonded ligand by a surface siloxy is far easier than an addition to M=C, M=N or M=C bonds, which is expected owing 

Ligands Susceptible to Reaction with Lewis Add Sites of Inorganic Oxides 

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