Allen-Millar-Trippett Rearrangement

Allen-Millar-Trippett Rearrangement with Mechanism

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Allen-Millar-Trippett Rearrangement
Allen-Millar-Trippett Rearrangement

Allen-Millar-Trippett Rearrangement is the ring expansion of cyclic phosphonium salts to form dihydro phosphinine.Cyclic Phosphonium salts are obtained by reacting Cyclic phosphines with Alkyl halides or acyl halides in presence of base like triethylamine.

Allen-Millar-Trippett Rearrangement

Mechanism:

The Lone electrons of the phosphorous atom of cyclic phosphine attack the carbon atom of acyl halides to form a phosphonium ion. After that, when refluxed with water, undergoes a rearrangement reaction to form dihydro phosphinine.

Allen-Millar-Trippett Rearrangement