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23.12.1.1.2 Method 2: Monoarylketenes from Arylacetic Anhydrides

DOI: 10.1055/sos-SD-023-00394

Tidwell, T. T.Science of Synthesis, (200623393.

Photolysis of benzoic phenylacetic anhydride (9, R1=H) in acetonitrile gives phenylketene (10, R1=H) in 70% yield, as determined by trapping with methanol.[‌38‌] This reaction is proposed to proceed through a Norrish type II process (Scheme 3). Benzoic diphenylacetic anhydride (9, R1=Ph) reacts similarly, giving diphenylketene (10, R1=Ph) in 50% yield.[‌38‌]

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