Isobutene reacts with trihalogenoethylenes in the gas phase at ca. 500° to give 1,1-dihalogeno-4-methylpenta-1,4-dienes which are precursors of photostable pyrethroid insecticides. The reaction appears suited to large scale continuous operation. The results are interpreted in terms of a free-radical chain mechanism.
W. Hewertson, D. Holland and D. J. Milner, J. Chem. Soc., Perkin Trans. 2, 1978, 1062 DOI: 10.1039/P29780001062
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