Pyridinium chlorochromate oxidative halogenation reagent

Halogenation of enol ethers and enol esters, leading directly to a-halo ketones is realized by use of molecular halogen or halide salts and metal oxidants. Pyridinium chlorochromate (PCC)/l2, Cr03/TMS-Cl/l2, AgOAcfi2, T10Ac/l2. ° Pb(OAc)4 and metal halides and Cu(OAc)2/l2 are useful classes of reagents for this conversion, and some examples are listed in Table 1. 

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