Where a lone pair with the nucleophile overlaps with the sigma* orbital on the leaving group. Even so, this action does not have the identical sensitivity to steric hindrance given that the SN2 reaction, as we are going to see. This reaction leads to the formation of two new C-halogen https://lanexsqjc.tinyblogging.com/5-essential-elements-for-is-bromazolam-a-controlled-substance-81542257