Patent ID: 6566521
Filing Date: 2003-05-20
Classification: B01J,C07C,C07F

Abstract:
A bidentate phosphate ligand of the formula wherein R1, R2, R3and R4 together form at least one aliphatic or aromatic ring, E is selected from the group consisting of Y is oxygen or sulfur, X is selected from the group consisting of â€”P(Rd)â€”, â€”P(O) (Rd)â€” and â€”P(OR6)â€” wherein Ra is alkyl of 1 to 8 carbon atoms, Rb is aryl of 6 to 18 carbon atoms, Rc is selected from the group consisting of hydrogen, alkyl of 1 to 8 carbon atoms, alkoxy of 1 to 8 carbon atoms, aryl of 6 to 18 carbon atoms, alkoxy of 1 to 8 carbon atoms, aryloxy of 6 to 18 carbon atoms, Ra(O)â€” and Rb(O); and Rd is one of Ra or Rb and R5 is alkyl of 1 to 8 carbon atoms or aryl of 6 to 18 carbon atoms.