Process for the preparation of 2-fluorophenylhydrazine

Details Process for the preparation of 2-fluorophenylhydrazine Process for the preparation of 2-fluorophenylhydrazine

1996-01-22

1997-02-04

O'Sullivan, Peter

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C24102

Patent

active

055999921

ABSTRACT:
The invention relates to a process for the preparation of 2-fluorophenylhydrazine or 2-fluorophenylhydrazine hydrochloride, which comprises diazotizing 2-fluoroaniline, reducing the resulting diazonium salt with alkaline bisulfite solution to give 2-fluorophenylhydrazine .alpha..beta.-disulfonate, hydrolyzing the latter with hydrochloric acid to give 2-fluorophenylhydrazine hydrochloride, adding alkali metal solution to neutralize the mixture, subsequently cooling the mixture, removing the 2-fluorophenylhydrazine precipitate by filtration and, if appropriate, reacting the latter with hydrochloric acid to give 2-fluorophenylhydrazine hydrochloride.

REFERENCES:
patent: 3410900 (1968-11-01), Kindler et al.
Patent Abstracts of Japan, vol. 11, No. 80, Mar. 11, 1987; JP-A-61 233656 (Nippon Nohyaku Co Ltd), Oct. 17, 1986.
Patent Abstracts of Japan, vol. 5, No. 67, May 7, 1981; JP-A-56 016454 (Mitsubishi Kasei Kogyo K.K.), Feb. 17, 1981.

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