Patent ID: 8222415

Claim:
A chiral phosphorus compound of formula (I): wherein R 1 , R 2 , R 3 , R 4 , R 5 are chiral or achiral groups selected from the list consisting of methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl, hexyl, F(CF 2 ) m (CH 2 ) n where m=1-10 and, n=0-4, cyclohexyl, menthyl, allyl, benzyl, —CH 2 O(CH 2 ) 2 OCH 3 , phenyl, tolyl, anisyl, trifluoromethylphenyl, F(CF 2 ) m (CH 2 ) n C 6 H 4 — where m=1-10 and n=0-4, bis(tri-fluoromethyl)phenyl, chlorophenyl, pentafluorophenyl, hydroxyphenyl, carboxyphenyl, NaO 3 SC 6 H 4 —, naphthyl, fluorenyl, pyridyl and furyl, and which, in the case of the pairs R 1 /R 2 and R 4 /R 5 , may be interconnected to form a ring.