[2+2] Cyclo-addition reactions of bis-pentamethylcyclopentadienyl zirconium metal complexes containing terminal chalcogenide ligands with the phospha-alkyne PCtBu. Syntheses, crystal and molecular structures of the four complexes [Zr(η5-(C5Me5)2(SC(tBu)P))], [Zr(η5-(C5Me5)2(SeC(tBu)P))], [Zr(η5-(C5Me5)2(SC(tBu)PSe))] and [Zr(η5-(C5Me5)2(SC(tBu)PC(Ph)N))]

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