Benzotriazole CAS 95-14-7

Factory Supply Benzotriazole CAS 95-14-7 with Best Price

  • Appearance: White powder
  • Assay: 99. 0%min
  • Stock: In stock
  • Sample: Available
  • Zhishang Chemical: Benzotriazole Suppiler&Manufacturer

Basic Info of Benzotriazole

What is Benzotriazole?

Benzotriazole is also known as 1,2,3-benzotriazole. Aliases: benzotriazepines, indene triazepines.

Appearance is white or yellowish needle-like crystal, which gradually oxidizes and turns red when exposed to air, soluble in alcohol, benzene, toluene and chloroform; slightly soluble in water. Benzotriazoles are a valuable compound. It is widely used in various aspects of chemistry. Such as preservatives, anticoagulants, lubricants, preparation dye intermediates, plant growth regulators, photographic antifogging agents, etc. as synthetic detergents.

Similar to 1,2,3-triazoles, benzotriazoles also have three tautomers, namely two 1H-configurations and one 2H-configuration. Experimental data and quantum chemical results show that the above equilibrium of benzotriazoles in solution and solid state shifts almost completely to the 1H-side, i.e. the 1H-isomer is the more stable isomer. However, the 2H-form of benzotriazole in the photoexcited triplet state is more stable.

The preparation method of benzotriazole, usually prepares o-aminobenzene diazonium salt with o-phenylenediamine diazotization, and then immediately cyclizes one-step synthesis to obtain benzotriazole crude product, then recrystallizes and filtrates, and dry to obtain benzene And pure triazole.

Benzotriazole Uses

  1. Benzotriazole, 5-chlorobenzotriazole and 6-nitrobenzotriazole are all effective antifogging agents and stabilizers in photosensitive materials, and are widely used in photographic paper emulsions and developing solutions.
  2. Benzotriazole is a useful anti-corrosion agent, especially for copper, which can form a layer of insoluble copper benzotriazole (I) with copper. It also has the same anti-corrosion effect on metal materials such as aluminum, cast iron, steel, nickel, and zinc. It can be added to antifreeze for automobile engines, lubricating oil for grinding and cutting, and cleaning fluid for copper and copper alloys to prevent corrosion and improve. The purpose of the corrosion inhibition effect.
  3. Benzotriazoles belong to ultraviolet absorbers and are the most important class of light stabilizers. The common ones are 2-(2′-hydroxy-5′-methylphenyl)benzotriazole (UV-P), 2-(2′-Hydroxy-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzotriazole (UV-326), 2-(2′-hydroxy-3′,5′ -Di-tert-butylphenyl)-5-chlorobenzotriazole (UV-327), etc., currently used in polyolefin, polyvinyl chloride, polystyrene, acrylic resin, polyester, polyamide, cellulose ester, etc. It is used as an anti-aging agent in plastics and also as a sunscreen.
  4. Benzotriazole is used in extreme pressure industrial gear oil, hyperbolic gear oil, anti-wear hydraulic oil, oil film bearing oil, lubricating grease and other lubricating greases, and can be used as anti-rust and gas phase corrosion inhibitor.
  5. Benzotriazoles and their derivatives can also be used in organic synthesis. 1-Hydroxybenzotriazole is a carboxyl activating reagent in peptide synthesis and is used as an auxiliary reagent in DCC synthesis of peptides. 1-Chlorobenzotriazole can be used as a chlorinating reagent, which transfers a Cl+ to a substrate, and as an oxidant, oxidizing primary and secondary alcohols to aldehydes and ketones.

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Application of Benzotriazole

Benzotriazole is an important fine chemical product. It has a wide range of uses, mainly used as a corrosion inhibitor for copper and copper alloys, a metal rust inhibitor, a photographic antifogging agent and an intermediate in organic synthesis. It is also widely used in paint additives, preservatives for synthetic detergents, anticoagulants, lubricant additives, synthetic dye intermediates, polymer material stabilizers, plant growth regulators, anti-discoloration agents, gas phase corrosion inhibitors and ultraviolet light absorption. agent.

The use of benzotriazole in combination with a variety of corrosion inhibitors can improve the corrosion inhibition effect. It can also be used in conjunction with a variety of scale inhibitors, bactericidal and algicides. It can produce better corrosion inhibition effect for closed circulating cooling water systems. Adding benzotriazole to antifreeze and coatings for automobiles can play the role of protective materials. In the machining process, adding benzotriazole to the cutting oil can keep the processed copper from discoloring.

Preparation of Benzotriazole

Many researchers at home and abroad have done a lot of research work on the synthesis of benzotriazoles. So far, the reported synthetic routes include o-phenylenediamine method, benzimidazolone method, o-nitrophenylhydrazine method, o-nitrochlorobenzene method, and the preparation of benzotriazepine from sodium benzotriazole azole method.

Reference

  1. Benzotriazole – WikiPedia
  2. 1H-Benzotriazole – PubChem
  3. CN201110204636.4 A kind of synthetic method of benzotriazole

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