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1,2- vs 1,4-Addition to 1,3-Butadiene

Organic

Mechanism showing HBr adding to 1,3-butadiene, with resonance structures of the allylic carbocation leading to 1,2- and 1,4-addition products.

Conjugated dienes

Resonance in the allylic carbocation explains why HBr addition to a conjugated diene gives both 1,2- and 1,4-products.

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