Imidazole
Imidazole is steady to acids and has antioxidant properties. Imidazole derivatives are broadly current in nature. Such as histamine, histidine, benzimidazole, etc. There are some fascinating reagents in the acyl compounds of imidazole. For example, 1-acetylimidazole is a steady acylating agent. Reacts with pyrrole to produce 1-acetylpyrrole. Furthermore, underneath regular circumstances, 1-acetylimidazole can generate ketones and aldehydes the use of Grignard reagents and decreasing agents. N. N '- carbonyl diimidazole reacts with carboxyl crew to generate beneficial reagent acyl imidazole. The relationship between imidazole and herbal compounds is extraordinarily close. For example, after condensation with pyrimidine rings, purine derivatives are obtained, which now not solely serve as bases for nucleic acids such as 6-aminopurine and guanine, however additionally exist in uric acid, caffeine, and theophylline in dwelling organisms. The catalytic impact of imidazole, such as accelerating enzyme hydrolysis, is presently being studied. Allergic to the skin, with toxicity comparable to that of diamines. Imidazole is barely greater alkaline than pyrazole and can generate steady salts such as picrate and nitrate. One use of imidazole is in metallic chelation affinity chromatography (IMAC) for the pure binding of His labeled proteins. The labeled protein binds to the nickel ion medium on the floor of the chromatography column, and extra imidazole passes thru the chromatography column to elute the labeled protein coordinated with nickel, ensuing in a high-purity goal protein. Imidazole is an necessary nice chemical uncooked material, on the whole used in the synthesis of prescription drugs and pesticides, as properly as as as as an epoxy resin curing agent. It is used as a pesticide uncooked material, as a synergistic agent for boric acid preparations, and in the manufacturing of pesticides and fungicides. Used as a curing agent for epoxy resin, it can enhance the mechanical homes of merchandise such as bending, stretching, and compression, enhance the electrical residences of insulation, and beautify the chemical resistance to chemical agents. It is extensively used in computer systems and electrical . Used in remedy for imidazole antifungal drugs, it is one of the foremost uncooked substances for tablets such as dichlorobenzimidazole, econazole, ketoconazole, clotrimazole, etc. It can be used as a rust inhibitor for copper in printed circuit boards and built-in circuits. It is additionally used as a uncooked fabric and natural synthesis intermediate for urea formaldehyde resin curing agents, photographic drugs, adhesives, coatings, rubber vulcanizing agents, anti-static agents, etc. It is additionally broadly used as a fruit preservative.
Polyvinylpyrrolidone, additionally recognised as PVP, is a polymer of ethylene pyrrolidone. Due to its one-of-a-kind ranges of polymerization, it can be divided into soluble PVP and insoluble PVPP (polyvinylpyrrolidone). The relative molecular weight of soluble PVP is 8000~10000, which can be used as a precipitant to precipitate with the aid of reacting with polyphenols. By the use of this method, there are without problems residual PVP in the wine. Due to the accumulation impact of PVP in the human body, the World Health Organization does now not advise the use of this substance. In current years, the use of soluble PVP has end up rare. The insoluble PVPP collection started out to be used in the beer enterprise in the early 1960s, with a relative mass larger than 700000. It is a polymer insoluble substance shaped by way of in addition cross-linking and polymerization of PVP, and can be used as an adsorbent for polyphenols, with excellent results.
Melting point | 88-91 ° C (lit.) |
Boiling point | 256 ° C (lit.) |
Density | 1.01g/mLat20 ° C |
Vapor pressure | <1mmHg (20 ° C) |
Refractive index | 1.4801 |
Flash point | 293 ° F |
Storage conditions | Storebelow+30 ° C |
Solubility | 0.1Mat20 ° C, clear, colorless |
Acidity coefficient | 6.953 (at 25 ℃) |
Form | crystal line |