Why in the bromination reaction of unsaturated hydrocarbons, when the bromonium ion is formed, the Br- anion, which acts as a nucleophile, adds to the more saturated carbon of the bromonium ion ring? my textbook says it's because the carbon is more positive, which sounds reasonable enough, however, as far as I know, -R groups are electron donating, so the carbon should be actually less positive, right (would be more stable if it was a carbocation)?