use
1. Used as a brominating agent in organic synthesis. Reacting with alcohol and phenol, hydroxyl is replaced into odor, ether is split into dimolecular bromoalkane, ester into acyl bromide, lactone into ωester. Deoxidizer. It forms isonitrile with formamide, and carbodiimide with N,N '1/2 substituted urea. The complex with DMF is used for Vilsmeier formylation reaction. Or make the middle alcohols into formates, make the primary alcohols into bromoalkanes and so on.
2. Dibromotriphenylphosphine was first used in a synthetic reaction in 1959 to prepare bromine and acyl bromide from alcohols and carboxylic acids, respectively, and also in the dehydration reaction of amide and oxime conversion to nitrile. It is now used as a general reagent in many reactions. Dibromotriphenylphosphine reacts with alcohol to first form an alkoxytriphenylphosphine bromide intermediate, which is then slowly decomposed into triphenylphosphine and bromide (Formula 1~)
Formula 3). Synthesis of aryl bromide from phenol By the reaction of triphenylphosphine dibromide with phenol, bromine aromatic compounds can be prepared.
Formula 4). Preparation of bromo-alkenes by reaction with ketones In acetonitrile solvent, the reaction of dibromo-triphenylphosphine with ketones can produce bromo-unsaturated compounds with good yield.
Formula 5). Cyclo-opening reaction of epoxides to o-dibromide In benzene solvents at room temperature, cyclo-opening reaction occurs between epoxides and triphenylphosphine dibromide to form o-dibromide.
Formula 6). Reactions with carboxylic acids, anhydrides and lipids to form acyl bromide Various carboxylic acids and anhydrides react with dibromotriphenylphosphine to produce acyl bromide (
Formula 7). Reaction with nitrogen ring compound to form bromoimide compound tricoordination nitrogen ring compound reacts with dibromotriphenylphosphine, can be opened nitrogen ring to produce bromoimide compound (
Formula 8). Reaction from 6-hydroxycarboline to the corresponding bromoides Reaction of 6-hydroxycarboline with dibromotriphenylphosphine can produce the corresponding bromoides (
Formula 9).
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