Preparation of complexes of palladium chloride with di-tert-butylsydnonylphosphine and diphenylsydnonylphosphine and structural analysis of the sydnone ring containing phosphine and palladium complex

Three sydnonylphosphinepalladium(II) chloride were prepared. X-ray analyses of complexes of diphenylsydnonylphosphine with palladium chloride reveals that the sydnone ring contributes electrons through phosphorus to metal resulting in decreasing substantial bond lengths. By comparing the bond length of PC(sydnone) and PC(phenyl) suggests that phenyl rings are able to contribute more electrons to phosphorus for chelation leading to short PC(phenyl) bond lengths.