The top proposal We now have for what is going on is formation of the cyclic halonium ion, which is a 3-membered ring bearing a favourable formal charge within the halogen. The predominance of allylic substitution above other positions is based on bond dissociation energies. An allylic C-H bond contains https://solution-de-bromoforme59258.isblog.net/solution-de-bromoforme-an-overview-54749072