After the SN2 reaction there should be an isobutyl group on the alpha carbon, making the amino acid a leucine. In the video there is an isopropyl group making it a valine (there was a carbon that disappeared in the SN2 reaction)
IDK if im missing something, but he does correctly identify it as a valine with the isopropyl group in the video, unless you’re referring to a missing carbon from earlier in the reaction mechanism (Br-C-Cx3 in the isopropyl group). I think there are 4C’s in isobutyl and 3C’s in isopropyl. But doesn’t the Br leaving mean there are 4 carbons remaining, with the C previously bonded to the -Br having a + charge, but maybe that C leaves somehow?
i think there's a missing Carbon in the chain, I think this amino acid should have been leucine, not valine, or there should have been one less carbon attached to the alkyl bromide.
