Patent ID: 6344560
Filing Date: 2002-02-05
Classification: C07B,C07C,C07D

Abstract:
A method for increasing the solubility of a compound having the structural formula: in an aromatic hydrocarbon solvent comprising adding to said solvent a nitroaromatic compound having the structure: wherein there is at least one part by weight he nitroaromatic compound for every ten parts by weight of the aromatic hydrocarbon solvent, and wherein, in formula II,(1) R25, R26, R27, R28, R29, and R30 are independently selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, substituted alkyl, substituted aryl, OR11, NR11R12, SR11, NO2, NO, CN, COR11, COOR11, CONR11R12, NR11COR12, and halogen, (2) any two adjacent groups of R25, R26, R27, R28, R29, and R30 can be taken together to form ring structure(s) of five to seven members, or (3) R25, R26, R27, R28, R29, and R30 are combinations of (A) and(B), provided that at least one of R25, R26, R27, R28, R29, and R30 is NO2, and R11 and R12 are independently selected from the group consisting of hydrogen, alkyl, aryl, benzyl, cyclic, and substituted alkyl or aryl, or R11 and R12 can be taken together to form a ring structure of five to seven members and, in formula I, R1 and R4 are independently selected from the group consisting of hydrogen, alkyl, and heteroatom-substituted alkyl and R2 and R3 are independently selected from the group consisting of alkyl and heteroatom-substituted alkyl; and X1 and X2 (1) are independently selected from the group consisting of halogen, cyano, â€”COOR7, â€”Sâ€”COR7, â€”OCOR7, (wherein R7 is alkyl or aryl), amido, â€”Sâ€”C6H5, carbonyl, alkenyl, or alkyl of 1 to 15 carbon atoms, or (2) taken together, form a ring structure of five to seven members with the nitrogen.