X-ray crystal structureHydrazones 2–22 were synthesized via the reaction of acetophenone with isatin derivatives and anhydrous hydrazine promoted by BF3 as a Lewis acid at 0°C. Structures of the synthesized hydrazones were determined on the basis of NMR and X-ray crystallographic analyses....
Lewis Structure It is drawn from the molecular formula of the compound. This is otherwise called an electron-dot structure, as electrons are shown as dots. This gives an idea about the bonding and nonbonding electrons present in the molecule. ...
The effect is to increase the length of the carbon skeleton. The rule is that π-stabilisation makes a carbanion centre less basic but more nucleophilic, as discussed in more detail elsewhere in this chemogenesis webbook, here. α-Effect ("alpha effect") bases like hydrazine and hydrogen ...
least one epoxide group with at least one compound B which contains at least one carboxylic acid group, wherein A and/or B also contains at least one (meth)acrylate group, in the presence of Lewis acid catalysts, each of which contains at least one directly bonded di(cyclo)alkylamino ...
The rechromatographed digest (bottom line) indicates that the majority of the glycans were of the oligomannose type, as they were converted to a smaller structure eluting around 25 ml (3.12 P4GU). Peak D also contained a mannosidase resistant component, denoted D'. Large peak around 12 ml ...
To facilitate the development of new processes, improvements to the synthetic approach and structural architecture of azolium precatalysts have been developed. A planar chiral benzimidazolium structure was synthesized as a racemate and chiral triazolium salts were synthesized with bulkier aryl hydrazine ...
1-Eu features an interesting four-shell structure, representing the largest Se-4f cluster incorporated POM known to date. Besides, 1-Eu exhibits excellent Lewis acid鈥揵ase catalytic activity and reusablity in catalyzing the gram-scale dehydration condensation reaction of hydrazines and 1,3-di...