M. Kant et al., Synthesis and characterization of 4-and 4,4 '-phosphorylated 2,2 '-bis(diphenylphosphanyl)-1,1 '-binaphthyls, EUR J ORG C, (3), 2001, pp. 477-481
A convenient reaction sequence has been established to obtain selectively t
he mono- or bisphosphorylated BINAP derivatives 6-9. The structure of the n
ew compounds was confirmed by NMR spectroscopy. The sodium salts of the pho
sphonic acid derivatives 8 and 9 can be used in aqueous biphasic catalysis.