Separation of p-fluoroaniline from the unsubstituted derivative

Details Separation of p-fluoroaniline from the unsubstituted derivative Separation of p-fluoroaniline from the unsubstituted derivative

C - Chemistry, Metallurgy

07

C

260/612.3

C07C 209/86 (2006.01) B01D 9/02 (2006.01) C07C 211/45 (2006.01) C07C 211/52 (2006.01)

Patent

CA 1270855

K 615 ABSTRACT The invention provides a process for separating a para- fluoro aniline from a corresponding para-unsubstituted aniline characterised by dissolving a starting mixture of a para- fluoro aniline of general formula I Image (I) wherein one of R1, R2, R3 and R4 is a hydrogen atom, a halogen atom, a C1-3alkyl group or a CF3 group, the others being independently selected from hydrogen atoms, halogen atoms and C1-3 alkyl groups, and R5 and R6 are selected from hydrogen and alkyl groups, and a corresponding para-unsubstituted aniline of general formula II Image (II) wherein R1, R2, R3, R4, R5 and R are the same as in formula I BX39.007 in an aqueous solution of a non-oxidising acid, and cooling the solution to allow a mixture of salts of the anilines of formulae I and II having a highest mol percentage of the aniline of formula I than in the starting mixture to crystallise out. BK39.007

507364

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