Reaction of furan, thiophene, selenophene, and tellurophene as well as 2-methyl and 2,5-dimethyl derivatives of the first two heterocycles with phenyl-, methyl-, and n-butyl-magnesium bromides in the presence of ligated nickel dichloride are shown to yield buta-1,3-dienes mostly with retention of configuration.
E. Wenkert, M. H. Leftin and E. L. Michelotti, J. Chem. Soc., Chem. Commun., 1984, 617 DOI: 10.1039/C39840000617
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