What is the function of butane-2,3 dione O-acetyl oxime in the C-C bond cleavage of 2-arylpyridines?

Label:chem

Topic
Liu described a method utilizing oxime esters to direct ortho C-H acylation and iminyl radical-mediated dual photo redox/palladium-catalyzed C-C bond cleavage.
Answer
Butane-2,3 dione O-acetyl oxime is used as a model substrate in the novel method for ortho C-H acylation and iminyl radical-mediated dual photo redox/palladium-catalyzed C-C bond cleavage of 2-arylpyridines. It undergoes SET with the excited photocatalyst to form an iminyl radical via C-O bond cleavage, which then generates a more stable acyl radical through C-C cleavage.
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