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The intermediates formed during the Beckmann fragmentation of α-alkoxy and α-alkoxy-α-alkyl oxime acetates have been successfully trapped as phosphonium salts, which were subsequently reacted with a variety of Grignard reagents to give the corresponding substituted products in good yields. Notably, this reaction proceeded smoothly even from α-alkoxy-α-alkyl oxime acetates.

Beckmann Fragmentation and Successive Carbon–Carbon Bond Formation Using Grignard Reagents <i>via</i> Phosphonium Salt Intermediates