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NFPA 704
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[Bis(trifluoroacetoxy)iodo]benzene C화학적 특성, 용도, 생산
화학적 성질
White to pale yellow crystalline powder
용도
[Bis(trifluoroacetoxy)iodo]benzene acts as a reagent in Pummerer-like reactions. It plays an important role in the direct alfa-hydroxylation of ketones under acidic conditions. It is involved in the cyclization of styryl amines to N-alkyl or N-aryl indoles. It serves as a reagent for the chemoselective deprotection of dimethoxybenzyl ethers and tosyloxylation of anilides. Further, it is used in the synthesis of 1,3,4-oxadiazoles by the oxidation of N-acylhydrazones. In addition to this, it is employed in the Hofmann rearrangement for the conversion of cyclobutanecarboxamide to cyclobutylamine hydrochloride.
Purification Methods
Crystallise the iodo compound from warm trifluoroacetic acid and dry it over NaOH pellets. Recrystallise it also from Me2CO/pet ether. Its melting point depends on the heating rate. [Spyroudis & Varvoglis Synthesis 445 1975, application: Almond et al. Org Synth 66 132 1988.]
