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Process for the preparation of aryl diazonium fluorides and aryl fluorides
Process for the preparation of aryl diazonium fluorides and aryl fluorides
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机译:制备芳基重氮氟化物和芳基氟化物的方法
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摘要
An aryl fluoride is prepared by the production of an aryl diazonium fluoride by the reaction, in liquid anhydrous hydrogen fluoride, at a temperature below the decomposition point of the diazonium fluoride produced, of an aromatic primary amine with either nitrosyl fluoride, or a nitrosyl fluoride complex of formula NOF.xHF where x is 3 or 6, or a mixture of the said fluoride and said complexes, and the subsequent decomposition by heat of the diazonium fluoride produced. The preferred amine is a monoamine in which the aromatic nucleus is that of a mononuclear aromatic hydrocarbon or a derivative thereof containing one to three substituents selected from alkoxy groups containing 1 to 6 carbon atoms, bromo, chloro, carboxyl, m-hydroxy, o-hydroxy, nitro, and sulphonic acid radicals. The diazotization is preferably effected in the temperature range of -30 DEG C. to +10 DEG C. and the decomposition in the range 25 to 70 DEG C. In examples, aniline, 4-cumidine and m-aminophenol are converted into fluorobenzene, 4-fluorocumene and m-fluorophenol, respectively. Other amines are also specified. Specification 941,537 is referred to.
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