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Application :

Used as chlorinating agent and catalyst in organic synthesis. It is the raw material for the production of medicines, dyes and chemical fibers, as well as for the production of phosphazene chloride and phosphorus oxychloride. Phosphorus pentachloride is mainly used as a chlorination reagent for alcohols, carboxylic acids, amides, aldehydes and ketones, enols and Beckmann rearrangement reagents. Conversion of alcohols and phenols to chlorides Phosphorus pentachloride can chlorinate alcohols and phenols (ROH/ArOH) to chlorides, and for secondary alcohols, conformational inversions can be obtained (
Formula 1). Under the action of phosphorus pentachloride, the 3-position phenolic hydroxyl group on the pyridine ring is chlorinated to chloropyridine (
formula 2). The acid chloride can be prepared by the reaction of phosphorus pentachloride and carboxylic acid to prepare acid chloride (
formula 3). In organic solvents such as benzene, ether, carboxylic acid and phosphorus pentachloride are reacted to prepare acid chloride, if the product can be directly recrystallized or distilled from the reaction mixture, then this method is very convenient (
formula 4). Preparation of geminal dichloride compounds from aldehydes, ketones and esters Under the action of phosphorus pentachloride, ketones and aldehydes can be converted into geminal dichloride compounds (
formula 5). When the ester has a derivative with a strong electron withdrawing group at the α-position, the corresponding geminal dichloro compound can also be obtained. Preparation of vinyl chloride from enol Phosphorus pentachloride can be reacted with a cyclic or acyclic carbonyl compound capable of forming enol to obtain vinyl chloride (
formula 6). Converting organic phosphoric acid into phosphorus oxychloride phosphorus pentachloride and organophosphoric acid can prepare corresponding phosphorus oxychloride (
Formula 7), this phosphorus oxychloride is a very useful reactive intermediate and can be used to synthesize other phosphorus-containing compounds. Synthesis of heterocyclic compounds Phosphorus pentachloride can catalyze the cyclization of heterocyclic compounds (Formula 8,
formula 9). Used as chlorinating agent, catalyst, dehydrating agent.

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