引用本文:
张天永, 张友兰, 邢文康. 甲醛还原法制备2,2'-二氯氢化偶氮苯[J]. 应用化学,
2004, 21(5): 521-523.
Citation: ZHANG Tian-Yong, ZHANG You-Lan, XING Wen-Kang. Preparation of 2,2'-Dichlorohydrazobenzene by Formaldehyde Reduction[J]. Chinese Journal of Applied Chemistry, 2004, 21(5): 521-523.
Citation: ZHANG Tian-Yong, ZHANG You-Lan, XING Wen-Kang. Preparation of 2,2'-Dichlorohydrazobenzene by Formaldehyde Reduction[J]. Chinese Journal of Applied Chemistry, 2004, 21(5): 521-523.
甲醛还原法制备2,2'-二氯氢化偶氮苯
English
Preparation of 2,2'-Dichlorohydrazobenzene by Formaldehyde Reduction
Abstract:
2,2'-Dichlorohydrazobenzene(DHB) was prepared in two steps. o-Chloronitrobenzene(OCNB) was at first reduced to 2,2'-dichloroazoxybenzene(DOB) in aqueous medium using 2,3-dichloro-1,4-naphthaquinone(OCNQ) as catalyst with yield of 99.4%, mp 53~56℃; DOB was then reduced by formaldehyde to give DHB in aqueous alkaline methanol with yield of 76%, 49% higher than reported, mp 82~83.5℃. DHB could be rearranged to 3,3'-dichlorobenzidine in strong acidic medium with yield 91.8%, mp 132~134℃.
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Key words:
- dichlorohydrazobenzene
- / dichloroazoxybenzene
- / dichlorobenzidine
- / formaldehyde
- / reduction
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