| 摘要 |
1,179,373. Aromatic mono-substitution. NATIONAL DISTILLERS & CHEMICAL CORP. 26 April, 1968, No. 19899/68. Heading C2C. [Also in Division C5] A process for introducing a substituent on to an aromatic ring of an aromatic compound by reacting said aromatic compound with a Group VIII platinum metal salt to form a substituted aromatic compound wherein the substituent is derived from the anion portion of said salt and selected from the group consisting of halides, cyanides, carboxylates, cyanates, alkoxides and aryloxides. In one embodiment the aromatic compound is reacted in the vapour phase at a temperature of at least 250‹ C. and at a pressure from 0À25 to 250 atm. and the substituent being introduced is derived from the anion portion of the Group VIII platinum metal salt, which is being continuously regenerated in situ by oxidation with oxygen in the presence of the acid corresponding to said salt. The process is particularly suited for the preparation of halobenzenes and in a further embodiment benzene is monohalogenated in the presence of an aqueous phase at a temperature above 250‹ C. with a catalytic amount of a Group VIII platinum metal chloride or bromide in the presence of a cupric or ferric chloride or bromide, the halide portion being the same in the cupric and ferric salt as in the Group VIII platinum metal salt. The production of chlorobenzene, benzonitrile, phenyl acetate, the chlorophenols and the chloronitrobenzenes is exemplified. Many types of aromatic compounds are suitable as starting materials, e.g. condensed rings, phenols, anilines, aromatic ketones, nitro compounds, aromatic halo-compounds, aryl sulphonic acids, aryl carboxylic acids, ethers, amides, mercaptans &c.
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