Others pivot from both bottom (like a hopper) and the side (like a casement). Also called Dual Action. Double-Hung Windows: Include offset upper and lower sashes, which can both move up and down in the frame. A window having two vertically sliding sash, each closing a different part of the window.
Reaction of sugar oxazolines with primary amines. In order to scrutinize the reaction pathway and structure of the reaction product, we started with a simple sugar oxazoline and a primary amine, carrying no other functional groups.
Sugar oxazolines, obtained by a dehydration reaction of 2-acetylamino pyranosides, reacted with primary amines in water to produce sugar imidazolines, which, when heated in water, were converted to sugar imidazoles by a dehydration reaction. The structures of these rather unexpected reaction products were determined by spectroscopic data.