4-ETHYL-2,6,7-TRIOXA-1-PHOSPHABICYCLO[2.2.2]OCTANE IN COMPLEXING WITH DIRHODIUM(II) TETRAACETATE

Abstract

A bicyclic phosphite, 4-ethyl-2,6,7-trioxa-1-phosphabicyclo [2.2.2]octane (1) was used for the complex formation with dirhodium(II) tetraacetate. Under the mole ratio P/Rh₂ = 2, the reaction leads to an axial adduct (AcO)₄Rh₂L₂. An excess of the phosphite (P/Rh₂ = 20) causes the rupture of the metalmetal liaison, reduction of Rh(II) to Rh(I), and formation of a coordinatively unsaturated complex (RhL₃)⁺ AcO⁻, which presents a new phenomenon. The complex was identified by low-temperature ³¹P NMR spectroscopy.

Key Words:

• Bicyclic phosphite
• rhodium complexes
• religation
• ³¹P NMR spectroscopy