Direct u.v. irradiation of the αβ-unsaturated trichloromethyl compound (1) gives the β-chlorodichloromethylene compound (2)via the intermediate allyl radical (5), which can be trapped as the β-bromodichloromethylene compound (4) if the reaction is carried out in BrCCl3.
B. B. Jarvis and R. O. Fitch, J. Chem. Soc. D, 1970, 408 DOI: 10.1039/C29700000408
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