Patent ID: 8222441

Claim:
A phosphorus-containing compound of general formula (I) wherein R 1 -R 10 are independently selected from the group consisting of H, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, phenyl, nitro, phenoxy, C 1 -C 10 halo-alkyl, C 3 -C 7 cyclic alkyl, —CF 3 , —OCF 3 and halogen; A is —OH or —NH 2 ; B is —OH or —NH 2 ; D is selected from the group consisting of —OH, —NH 2 , C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 10 halo-alkyl, C 3 -C 7 cyclic alkyl, —CF 3 , —OCF 3 , halogen, —NHR 1 , —NH(C═O)—R 1 , —NH(O═C—O)—R 1 , —NH(O═C—NH)—R 1 , X is oxygen atom or —NH; Y is selected from the group consisting of hydrogen, —NO 2 , —OH, —NH 2 , —COOH, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 3 -C 7 cyclic alkyl, —CF 3 , —OCF 3 and halogen; R 11 -R 12 are independently selected from the group consisting of H, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, phenyl, nitro, phenoxy, C 1 -C 10 halo-alkyl, C 3 -C 7 cyclic alkyl, —CF 3 , —OCF 3 and halogen; with the proviso that (1) when D is —OH and A and B are —NH 2 , at least one of R 1 -R 10 is phenyl, nitro or phenoxy; or (2) when A, B and D are —OH, (i) at least one of R 1 -R 10 is C 1 -C 10 halo-alkyl, —CF 3 or —OCF 3 ; or (ii) at least one of the combinations, (R 1 , R 2 ), (R 3 , R 4 ), (R 5 , R 6 ), (R 7 , R 8 ) and (R 9 , R 10 ), is different from the other combinations; or (3) when D is selected from the group consisting of C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 10 halo-alkyl, C 3 -C 7 cyclic alkyl, —CF 3 , —OCF 3 and halogen, and A and B are —NH 2 , at least one of R 1 -R 10 is phenyl, nitro or phenoxy; or (4) when A, B and D are —NH 2 , (i) at least one of R 1 -R 10 is phenyl, nitro or phenoxy and at least one of the combinations, (R 1 , R 2 ), (R 3 , R 4 ), (R 5 , R 6 ), (R 7 , R 8 ) and (R 9 , R 10 ), is different from the other combinations; or (ii) at least one of R 1 -R 10 is phenyl, nitro or phenoxy and at least one of R 1 -R 10 is C 1 -C 10 halo-alkyl, —CF 3 or —OCF 3 .