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[ Last edited by ylz83 on 2007-8-8 at 13:27 ]

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xhz1967

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4Â¥2007-08-08 09:47:39
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xhz1967

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Nitration of some phenols and anilines under mild conditions.     Kashmiri, M. Akram; Khan, M. Shafiq.    Dep. Chem.,  Gov. Coll.,  Lahore,  Pak.    Science International (Lahore)  (1989),  1(3),  177-9.  CODEN: SINTE8  ISSN: 1013-5316.  Journal  written in English.    CAN 112:118358    AN 1990:118358    CAPLUS  

Abstract

Nitration of some phenols and anilines with 4-methyl-4-nitrotetrabromocyclohexadienone in ether under mild conditions is reported.  Resorcinol, pyrogallol, catechol, o-cresol, o- and m-toluidines gave 4-substituted products while hydroquinone, p-cresol, p-toluidine and phloroglucinol gave 2-substituted products.  Phenol and aniline both gave a mixt. of ortho and para substituted products.  While benzene, toluene, anisole and N,N-diethylanaline were not nitrated under the conditions.
2Â¥2007-08-08 09:37:46
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xhz1967

½ð³æ (ÕýʽдÊÖ)

Nitration of aromatic compounds with 4-methyl-4-nitro-2,3,5,6-tetrabromocyclohexadienone under mild conditions.     Kashmiri, M. Akram; Munawar, Munawar Ali; Yasmin, Rizwana; Khan, M. Shafiq.    Dep. Chem.,  Gov. Coll.,  Lahore,  Pak.    Journal of Natural Sciences and Mathematics  (1988),  28(2),  289-301.  CODEN: JNSMAC  ISSN: 0022-2941.  Journal  written in English.    CAN 111:57142    AN 1989:457142    CAPLUS  

Abstract

4-Methyl-4-nitrotetrabromocyclohexadienone in ether was successfully used for the mononitration of highly activated arom. substances which contain hydroxy and amino groups, at room temp.  For example, catechol, p-cresol, and aniline were converted into 4-nitrocatechol, 2-nitro-p-cresol, and 4-nitroaniline resp., in good yield.  In the case of phenol and aniline minor quantities of o-nitro derivs. were also obtained.  The results show that the reagent is very useful for the selective mononitration of arom. substrates which contain hydroxy or amine groups.  Two possible mechanisms, one involving charge-transfer complex formation and another one involving ion pair formation, are proposed.
3Â¥2007-08-08 09:41:05
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ylz83

Òø³æ (СÓÐÃûÆø)

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5Â¥2007-08-08 13:27:31
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