New aspects in the chemistry of perphosphorylated calix[4]resorcinarenes

Abstract

Interaction between calix[4]resorcinarenes 1 and 2-amino-1,3,2-diheterophosphorinanes 2 resulted in sterically pure polyphosphocyclic conjugates 3. The structure of which was supported by NMR spectroscopy and X-ray diffraction analysis. The possibility of further modification of perphosphorylated resorcinarenes 3 was studied. It was shown that compounds 3a,b containing tBu-N groups at the phosphorus atoms do not enter into reactions increasing the coordination number of phosphorus because of steric hindrance. Sterically less hindered phosphoresorcinarenes 3c-i readily add sulfur, oxygen, and form octanuclear and chelate complexes with transition metals (Mo and Pd, respectively).