Construction by extrusion of Cp2Zr from phosphaalkyne dimer complexes

2 Construction by Extrusion of Cp2Zr from Phosphaalkyne Dimer Complexes 

A high-yielding synthesis was required before systematic investigations of the reactivity of the phosphacubane system could be realized. This was achieved by splitting the cyclotetrameriza-tion of the phosphaalkyne into two cyclodimerization steps the first step is the synthesis of the ziiconocene complex 59 and the second is the removal of its Cp2Zr fragment with subsequent renewed dimerization to furnish the tetraphosphapentacyclic system 53. 

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