N-Benzyl and N-aryl bis(phospha-Mannich adducts): Synthesis and catalytic activity of the related bidentate chelate platinum complexes in hydroformylation

The microwave-assisted double Kabachnik–Fields (phospha-Mannich) reaction of benzylamine and arylamines, two equivalents of paraformaldehyde and the 2 bonds on the lefthand sideP(O)H reagent, such as dialkyl phosphites, ethyl phenyl-H-phosphinate and diphenylphosphine oxide gave the bis(2 bonds on the lefthand sideP(O)CH2)amine derivatives in good yields. The bis(diphenylphosphinoxido) derivatives were converted to the corresponding ring platinum complexes after deoxygenation whose catalytic activity was tested in the hydroformylation of styrene. Crystal structure analysis of one of the complexes reveals interesting correlations between complex structure and solvent inclusion.