Complexation properties of aminophosphites bearing phosphorus and nitrogen atoms included in six-membered cycles

A series of amino phosphites having phosphorus or/and nitrogen atoms, which are included in a six-membered cycle, has been synthesized. The presence of such cycles in these P,N-bidentate ligands has been shown to strongly influence the ways of their coordination with Rh(I) and Pd(II) atoms. The resulting chelate complexes have been found to be less stable when the six-membered chelate metalacycle formed and the initial cycle of the ligand molecule comprise a bicyclic system with the phosphorus or nitrogen atom being as a spiro atom.