Yang Shan-yao
2006
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Journal
Shandong Chemical Industry
Abstract
This article provides a new process for the preparation of 3,3'-dichlorobenzidine by reduction of o-nitrochlorobenzene with formaldehyde and zinc power,and subsequent so-called benzidine rearrangement catalyzed by hydrochloric acid and purification.The total yield and the purity of 3,3'-dichlorobenzidine can reached to 82% and 99%,respectively.