Synthesis and reactivity of a triphenyltin-functionalized 1<Emphasis Type="Italic">H</Emphasis>-(3,5-dimethylpyrazol-1-ylmethyl)-1,2,3-benzotriazole

Treatment of 1H-(3,5-dimethylpyrazol-1-ylmethyl)-1,2,3-benzotriazole CH₂(3,5-Me₂Pz)(Bt)] with one equivalent of n-BuLi followed by Ph₃SnCl gave a ditin derivative (Ph₃Sn)₂C(3,5-Me₂Pz)(Bt)]. Use of two equivalents of n-BuLi gave CH₂(3,5-Me₂Pz)(Bt-SnPh₃) together with (Ph₃Sn)₂C(3,5-Me₂Pz)(Bt). Reaction of (Ph₃Sn)₂C(3,5-Me₂Pz)(Bt) with W(CO)₅(THF) gave (Ph₃Sn)₂C(3,5-Me₂Pz)(BtW(CO)₅), while the reaction of CH₂(3,5-Me₂Pz)(Bt-SnPh₃) with W(CO)₅(THF) resulted in the formation of three complexes, namely CH₂(3,5-Me₂Pz)(Bt-SnPh₃)W(CO)₅, CH₂(3,5-Me₂Pz)(Bt-SnPh₃)W(CO)₄ and CH₂(3,5-Me₂Pz)(Bt)W(CO)₄. All of these products have been characterized by physicochemical and spectroscopic methods. In addition, the structures of five of the compounds have been confirmed by X-ray structural analyses, revealing that the functionalized 1H-(3,5-dimethylpyrazol-1-ylmethyl)-1,2,3-benzotriazole has variable coordination modes.