Hydrophosphorylation of 1,3-diphenyl-2-propen-1-one and 4-phenyl-3-buten-2-one in the coordinational sphere of carbonyl complexes of Group VIB metals

Synthetic procedures for preparing eta (2) and eta (4) complexes of chalcon e and benzalacetone with hexacarbonyl mononuclear complexes of Group VIB me tals were developed and conditions for selective eta (2)- and eta (4)-coord ination of the heterodiene ligand were established. Hydrophosphorylation of the obtained complexes proceeds in the coordination sphere of the metal by the Abramov reaction scheme and yields the corresponding eta (2)-coordinat ed alpha -hydroxyphosphonates. As follows from quantum-chemical calculation s, pi -coordination with metals makes the heterodienes no longer planar, wh ich explains their regioselective phosphorylation by the more electrophilic carbonyl group.