Synthesis and Characterization of 4‐ and 4,4′‐Phosphorylated2,2′‐Bis(diphenylphosphanyl)‐1,1′‐binaphthyls

A convenient reaction sequence has been established to obtain selectively the mono- or bisphosphorylated BINAP derivatives 6−9. The structure of the new compounds was confirmed by NMR spectroscopy. The sodium salts of the phosphonic acid derivatives 8 and 9 can be used in aqueous biphasic catalysis.