Reaction of alkylphenylacetylenes, PhC![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CR (R = H or alkyl)(1), with CuCl2–LiCl or CuCl2–I2 in acetonitrile gives the corresponding dihalogenoalkenes in good yields; E-addition is favoured except in the chlorination of (1, R = But) where Z-addition predominates.
S. Uemura, A. Onoe and M. Okano, J. Chem. Soc., Chem. Commun., 1975, 925 DOI: 10.1039/C39750000925
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