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.
How can amines act as a base. Nitrogen atom is an ammonia molecule also has a lone pair of electron, can accept protons , so amine can act as a Bronstead Lowry Base. Compare ammonia and amines in terms of base strength. Primary aliphatic amines are stronger bases than ammonia because of the alkyl group. Alkyl groups are electron releasing groups. This makes its lone pair of electron more available to form a co-ordinate bond. increase in base strength as the length of alkyl chain increases.