17-2 Reactivity of Enols:a-Substitution Reactions Enols are nucleophiles that react with electrophiles -There is a substantial build-up of electron density on the a carbon of the enol Electron-rich Enol tautomer Cngg Loaring All Pights Reserved Enols are nucleophiles that react with electrophiles ▪ There is a substantial build-up of electron density on the a carbon of the enol 17-2 Reactivity of Enols: α-Substitution Reactions