How does the carbon hybridization impact the rate of metal-carbon bond cleavage by an alkyne? A case study with POCOP-pincer ligated palladium hydrocarbyl complexes

The reaction of POCOP-pincer ligated palladium hydrocarbyl complexes with phenylacetylene shows a general reactivity order of Pd-Csp3 > Pd-Csp2 > Pd-Csp with the phenyl complex being an exception. The related palladium hydride complex is much more reactive than these hydrocarbyl complexes. 113