Reactivity of 4‐Pyridyltellurolate with Pd(II)/Pt(II) Complexes

Reactions of 4‐pyridyltellurolate with various palladium and platinum complexes have been investigated. Treatment of MCl 2 (dppe) and two equivalents of Na(4‐TeC 5 H 4 N) gave cis ‐[M(4‐TeC 5 H 4 N) 2 (dppe)] (M=Pd ( 1 ), Pt ( 2 )). Similar reactions of MCl 2 (dppm) exclusively yielded unexpected products, [Pd 2 (μ 3 ‐Te)(μ 2 ‐4‐TeC 5 H 4 N)(4‐TeC 5 H 4 N)(μ‐dppm)] 2 (M=Pd ( 3 )) and [Pt{(Ph 2 P) 2 C(4‐TeC 5 H 4 N)} 2 ] (M=Pt ( 4 )). The cis and trans forms of [PdCl(4‐TeC 5 H 4 N)(PPh 3 )] 2 ( 6 a, 6 b ) could be isolated from the reaction of polymeric complex [PdCl 2 (4,4′‐(C 5 H 4 N) 2 Te 2 )] n ( 5 ) and PPh 3 . All the phosphine complexes have been characterized by NMR and X‐ray crystallography. Complex 3 contains bridging dppm ligand whereas 4 is formed via deprotonation of methylene carbon of dppm ligand.