Preparation and Structure of Dichloropalladium(II) Complexes of Sterically Protected Diphosphinidenecyclobutenes and Their Synthetic Application as Homogeneous Catalyst

Sterically protected 3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutenes reacted with bis(acetonitrile)dichloropalladium(II) to give the corresponding dichloropalladium complexes and the structure of one of the complexes was confirmed by X-ray crystallography. The complexes were utilized as a homogeneous catalyst in the coupling reaction of trimethylsilylacetylene and 1-bromo-4-nitrobenzene.