Treatment of isoprene with an excess of the couple potassium t-butoxide–lithium tetramethylpiperidide in tetrahydrofuran, followed by addition of a higher alkyl bromide or oxirane, gives the dienes H2C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CHC(CH2)CH2R (R = alkyl or –CH2CH2OH) in reasonable yields.
P. A. A. Klusener, H. H. Hommes, H. D. Verkruijsse and L. Brandsma, J. Chem. Soc., Chem. Commun., 1985, 1677 DOI: 10.1039/C39850001677
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