Glycosylations are often assumed to proceed through an oxocarbenium ion intermediate, in an S N 1-like mechanism. However, the true reaction picture is often much more complicated. Glycosylation reactions are further complicated by counterion effects, formation of ion pairs, unexpected catalyst/promotor interactions, solvent effects, and substrate specificity. The key to developing new and improved glycosylation methods might be to get a better understanding of the mechanisms through which they proceed. In 2019, Nielsen et. al. reported a new glycosylation method relying on sulfonyl carbamates as self-promotors (a compound that acts as both promotor and acceptor) and trichloroacetimidate glycosyl donors in N -glycosylations (Scheme 1). 14 The scope has later been expanded to include sulfonyl amides, thiocarbamates, and urea derivatives. These glycosylations take place without any additives, making them ideal as a model system for a mechanistic study.