Rare earth compounds induced nitrogen - nitrogen bond coupling
In this study, rare earth compounds, amino [(Me_3Si) _2N] _3Ln (μ-Cl) Li (THF) _3 NN bond coupling reaction induced and azo compounds and rare earth chloride hydrazine catalytic synthesis of benzimidazole, benzo thiazole, and benzo response properties of nitrous Zhuo Yansheng, the text is divided into three parts.
One. Amine compounds of RE [(Me_3Si) _2N] _3Ln (μ-Cl) Li (THF) _3 reaction with various aromatic amines and hydrazine the corresponding azo compounds. Also studied the electronic effects, spatial effects, solvent effects, etc. for the reaction yield. Studies show that rare earth compounds can lead to amino nitrogen - nitrogen bond coupling reaction, synthesis of a variety of azo and hydrazine derivatives, the reaction has a short time, mild reaction conditions and other characteristics, as azo compounds and the hydrazine synthesis provides a good preparation.
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II. Of the rare earth chloride as a catalyst o-phenylenediamine, o-aminothiophenol and aldehydes react preparation and Benzothiazole benzimidazole derivatives reactivity of the electronic effects, spatial effects and different rare earth metal ions For the reaction yield. Study showed that the catalyst of rare earth chloride to get a higher yield of benzimidazole and benzothiazole derivatives. At the same time, the reaction using ultrasound technology and solvent-free reaction conditions, the reaction has high yields, short reaction time, catalyst and reaction products of economic and easy post-processing was simplified and so on. The most important thing is to get both disubstituted benzimidazole product, the reaction selectivity.
III. Of the rare earth chloride catalyzed reaction of o-phenylenediamine with ketones Zhuoyan Sheng benzodiazepine preparation materials, but also used the ultrasound technology and solvent-free reaction conditions, the reaction has high yields, short reaction time, etc., in line with green chemistry concept.
In short, by rare earth compounds cause amino nitrogen - nitrogen bond coupling reaction was prepared in high yield azo compounds and hydrazine, while studies have shown that rare earth chlorides in the synthesis of benzimidazole, benzothiazole and benzodiazepine Zhuo Yansheng reaction compounds showed high catalytic activity for the development and use of rare earth compounds provides a theoretical basis.
