The reaction of 1,3-butadiene with 1 equivale | vedclass

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(B) The reaction of $1,3$-butadiene with $1$ equivalent of $HBr$ is an electrophilic addition reaction.At low temperature $(-80^{\circ}C)$,the reactio

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Position isomers

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(B) The reaction of $1,3$-butadiene with $1$ equivalent of $HBr$ is an electrophilic addition reaction.At low temperature $(-80^{\circ}C)$,the reaction is under kinetic control,favoring the formation of the $1,2$-addition product,which is $3$-bromo-but-$1$-ene $(B)$.At higher temperature $(25^{\circ}C)$,the reaction is under thermodynamic control,favoring the formation of the more stable $1,4$-addition product,which is $1$-bromo-but-$2$-ene $(A)$.In $3$-bromo-but-$1$-ene,the bromine atom is at the $3$-position,while in $1$-bromo-but-$2$-ene,the bromine atom is at the $1$-position.Since the position of the functional group (bromine) changes relative to the carbon chain,$A$ and $B$ are position isomers.

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