A New Mode of Reaction of tert‐Butyl‐phosphaethyne: Trinuclear Cyclopentadienyl‐cobalt Clusters with P, PS, and PO as μ3 Complex Ligands

Complete cleavage of the phosphorus-carbon triple bond is the characteristic step in the reaction of tert-butylphosphaethyne with 1 under mild conditions, which leads to the formation of the μ3-carbyne-μ3-phosphidotricobalt cluster 2. The phosphido ligand in 2 can be oxidized with oxygen or sulfur to give PO and PS ligands, respectively. The phosphane arm in the starting material is evidently necessary for the formation of cluster 2. R = CH2CH2PtBu2, R′ = tBu