Versatile, concise and convenient process for the commercial scale preparation of highest pure 3,3'5,5'-Tetramethylbenzidine (TMB) and its salts, a chromogenic substrate used in staining procedures in immunohistochemistry and visualizing reagent in enzyme-linked immunosorbent assays
申请人:Alla Sekar Reddy
公开号:US20210114974A1
公开(公告)日:2021-04-22
The present invention relates to a process for the preparation of 3,3′,5,5′-Tetramethylbenzidine represented by formula I, and processes for the preparation of intermediates used in the preparation of 3,3′,5,5′-Tetramethylbenzidine.
Fast Synthesis of Hydrazine and Azo Derivatives by Oxidation of Rare-Earth-Metal−Nitrogen Bonds
作者:Lijun Zhang、Jing Xia、Qinghai Li、Xihong Li、Shaowu Wang
DOI:10.1021/om1009928
日期:2011.2.14
A novel N−N coupling reaction was developed through the oxidation of rare-earth-metal−nitrogen bonds produced by treatment of the easily available rare-earth-metal amides [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 with aromatic primary or secondary amines. The reaction provides the symmetrical or unsymmetrical azo compounds and hydrazinederivatives in good to high yields within a very short time under mild conditions
A number of chloro-, methyl- and methoxy-substituted azobenzenes have been reduced to the corresponding hydrazines by using an aqueous solution of Na2S2O4. The yield is generally excellent, but two compounds, viz. 4,4-dimethoxyazobenzene and 2,2,4,4,6,6-hexamethylazobenzene, gave no hydrazine at all.
Versatile, concise and convenient process for the commercial scale preparation of highest pure 3,3′5,5′-tetramethylbenzidine (TMB) and its salts, a chromogenic substrate used in staining procedures in immunohistochemistry and visualizing reagent in enzyme-linked immunosorbent assays
申请人:Alla Sekar Reddy
公开号:US11028044B2
公开(公告)日:2021-06-08
The present invention relates to a process for the preparation of 3,3′,5,5′-Tetramethylbenzidine represented by formula I, and processes for the preparation of intermediates used in the preparation of 3,3′,5,5′-Tetramethylbenzidine.
本发明涉及以式 I 为代表的 3,3′,5,5′-四甲基联苯胺的制备工艺,以及用于制备 3,3′,5,5′-四甲基联苯胺的中间体的制备工艺。
Liquid crystalline solvents as mechanistic probes. 11. The syn .fwdarw. anti thermal isomerization mechanism of some low-bipolarity azobenzenes