The bromine radical attacks a neighboring double bond in a 5-EXO fashion. This means that the bromine radical will initiate a cyclization reaction to form a five-membered ring. The fluoro substituent in the allyl group can participate in this cyclization, influencing the stereochemistry of the product.
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[3-(2-Bromo-1-butoxy-ethoxy)-4,5,5-trifluoro-pent-4-enyl]-benzene
butenolide
