Process for the preparation of 5-nitrobenzimidazolone-(2)

Details Process for the preparation of 5-nitrobenzimidazolone-(2) Process for the preparation of 5-nitrobenzimidazolone-(2)

C - Chemistry, Metallurgy

07

D

260/314.5

C07D 235/24 (2006.01) C07D 235/26 (2006.01)

Patent

CA 1132582

HOE 79/F 022 PROCESS FOR THE PREPARATION OF 5-NITROBENZIMIDAZOLONE-(2) Abstract of the disclosure: Nitration of benzimidazolone-(2) with nitric acid in water at 20 to 100°C yields 5-nitrobenzimidazolone-(2) in high yield and purity. Since no side reactions occur the mother liquor can be recycled, thus avoiding waste water problems. The product can be reduced to 5-aminobenzimida- zolone-(2) which is a diazo component for azo dyes which, in turn, can be reacted with diketene to yield 5-acetoace- tylamino-benzimidazolone which is a coupling component for azo dyes, especially pigments.

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