Synthesis and study of the stability of phosphane palladacycles

: The chemistry of phosphane palladacycles[1] has been amply developed in last years. This kind of chemistry results interesting due to their applications in numerous fields such as organic synthesis[2], catalysis[3] or as potential biologically active materials[4]. Palladacycles bearing the diphosphine dppm have been described before[5] and we now report a new behavior shown by palladacycles of the type [Pd 2 (Ph 2 PCH 2 PPh 2 −P,P) 2 (C,N:C,N)]. In this case the coordination of dppm spontaneously shifts from chelate to bridging mode in solution giving a core A-frame conformation with two palladium atoms with a chlorido or bromido ligand between them.