Solid-liquid phase transfer catalysis improved method of prepari

Details Solid-liquid phase transfer catalysis improved method of prepari Solid-liquid phase transfer catalysis improved method of prepari

1977-10-31

1979-02-20

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260440, 260446, 260447, 2605676M, 2606065F, 260646, C07C 8511, C07C 8524, C07C 7912

Patent

active

041407199

ABSTRACT:
A method of preparing 2,4-difluoroaniline by reacting 2,4,5-trichloronitrobenzene with a fluorinating agent in the presence of a solid-liquid phase interface, and utilizing a phase transfer catalyst to form 2,4-difluoro-5-chloronitrobenzene, followed by hydrogenation with hydrogen in the presence of a hydrogenation catalyst to form 2,4-difluoroaniline.

REFERENCES:
patent: 2634280 (1953-04-01), Tribalat et al.
patent: 3024283 (1962-03-01), Metcalfe et al.
patent: 3117983 (1964-01-01), Matthews
patent: 3721706 (1973-03-01), Hoffmann et al.
patent: 3992432 (1976-11-01), Napier et al.
Finger et al., "JACS", vol. 78, pp. 6034-6037 (1956).
Kraus et al., "Catal. Proc. Int. Congr.", 5th, pp. 1073-1084 (1972).

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