Where a lone pair within the nucleophile overlaps With all the sigma* orbital on the leaving group. On the other hand, this move does not have the identical sensitivity to steric hindrance given that the SN2 reaction, as we're about to see. However, halogens are not electrophillic enough to interrupt https://traviszlyjv.jts-blog.com/36443061/helping-the-others-realize-the-advantages-of-solution-bromure-de-potassium