= Buta-1,3-diene
= 1,3-Butadiene
{synonym}
<Buta-1,3-diene> is $\mathrm{CH_2=CH-CH=CH_2}$, a four-carbon <diene> with a <conjugated system>. Adjacent p orbitals allow <electron> delocalization across the two <double bonds> and the intervening single bond.
A suitable cisoid conformation can react with a <dienophile> in a <Diels-Alder reaction>. The need for the reactive conformation connects internal rotation with <cycloaddition> reactivity.
<Organic Chemistry by John McMurry>[Chapter14, Conjugated Compounds: conjugated dienes and the Diels-Alder reaction]{ref}
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