As expected, electron-rich ketones and aldehydes were found to react faster than the electron-poor counterparts, and the corresponding deoxygenated products were obtained in good yields under the optimized reaction conditions (entries 4, 12, 15, and 16).
In addition the electronic effects resulting from electron rich and electron poor comonomers cross-propagating with an electron rich or electron poor terminal radical favor fast cross-propagation.
The reaction is robust regarding electronic effects because the electron rich substrates are more reactive.
As expected, a more electron-rich phosphine gave more aryl phenyl transfer product (entry 6).[ 21] Electron-poor phosphines, which have been reported to suppress transfer for the arylation of ureas,[ 20] gave similar or a small increase in selectivity as hoped, but for the more selective reaction, the conversion was poor (entries 8-10).
This means that the nanotube is relatively electron rich in this molecule, and the N2O is relatively electron poor.
They are usually regular copolymers with alternating electron deficient and electron rich units along the polymer backbone, that exhibit a relatively low band gap associated with an intramolecular charge transfer transition between the electron rich and electron deficient units.
Aldehydes are electrophiles (electron deficient species) that form covalent bonds with nucleophilic (electron rich) sites on biological targets.
Because the aromatic phenyl and S CH3 groups of Phe435 and Met306 are electron rich, conditions would be unfavorable for binding of bisphenol AF's electron-rich CF3 groups.
Regarding the aryl donors, electron poor boronic acids give higher yields compared to their electron rich counterparts.
The oxygen atom of an oxime is generally electron rich and is ready to transfer to an electron deficient carbon.
However, because the CF3 group is very electron rich, the structural elements standing face to face with CF3 must also be electron rich, resulting in their electrostatic repulsion.
