The tri-isopropylphenylsulphonylhydrazone of methyl vinyl ketone undergoes the Shapiro reaction to give 2-lithiobuta-1,3-diene which reacts with aldehydes to give 2-substituted dienes with high regioselectivity.
P. A. Brown and P. R. Jenkins, J. Chem. Soc., Perkin Trans. 1, 1986, 1129 DOI: 10.1039/P19860001129
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