The $\ce{-[NMe3]+}$ group is ranked almost at the first position in the -I effect series, which is often given at the very beginning of the teaching of general organic chemistry. I know this can be justified by hyperconjugation, but I am interested in a rigorous justification by molecular orbita...

The paper Analysis of cyclic pyrolysis products formed from amino acid monomer has the following to say in it's experimental section: Glycine, phenylalanine, tyrosine, tryptophan, serine, and valine were purchased from Daejung Chemicals & Metals Co. (Korea). Arginine, aspartic acid, glutamic ...