Abstract
AbstractThe 300 MHz 1H‐n.m.r. spectra of β‐D‐allose (1), α‐D‐galactopyranosyl‐(1 → 6)‐D‐glucopyranose (melibiose) (2), β‐D‐galactopyranosyl‐(l → 4)‐D‐glucopyranose (lactose) (3) and O‐β‐D‐xylo‐hexopyranosyl‐3‐ulose‐(1 → 4)‐D‐glucopyranose (3‐keto‐lactose) (4) are discussed. From comparative considerations of shift increments caused by several substitutions (e.g. downfield shift of 0.1‐0.2 p.p.m. of an axial proton by the presence of a synaxial and a vicinal axial OH, but an absence of any effect on the equatorial proton) it is corroborated that 3‐keto‐lactose occurs in the hydrated form in D2O.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have