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Exact(8)
Given that there is limited electronic communication between the substituent and the isoindigo core in the 5,5′-substituted compounds, this observation further implies that the energy of the CT bands of these compounds depends on the electronic nature of the substitution, with the more electron rich BT substitution lowering the energy of the CT band more effectively.
Biosynthetic pathways for producing higher alcohols elongate and reduce these central metabolites into more electron rich compounds, like higher carbon acyl-CoAs and 2-keto acids.
The relationships between electron density of the FeFe bond and the catalytic activity of these complexes were revealed, which showed that the more electron rich the FeFe bond is, the better catalytic hydroxylation activity was achieved.
And the improved photovoltaic property of the polymer PCTTBTC12 probably can be contributed to the better light absorption spectrum and enhanced hole transporting ability related to the more electron rich nature and planar structure of the thieno[3,2-b] thiophene group.
In all three mechanisms, the C8 atom was found to be more electron rich than the C2 atom (−0.443 vs −0.204 in mechanism 1a, −0.383 vs −0.12 in mechanism 1b, and −0.350 vs −0.084 in mechanism 1c), while the charge on Pd was around 0.6 in all cases.
On the other hand, more electron rich α-methoxystyrene underwent reaction with the β-methylated o-QM to afford the chroman 76 in a 55% yield and 4 1 dr. The combination of EVE and the respective o-QM yielded the chroman 77 in 70%.
Similar(52)
The reactions of phenol 3 with methyl-substituted salts 1 are influenced by both electronic and ortho effects, whereas only electronic factors are important with more electron-rich methoxy salts 2. The selectivities that were obtained with aniline 6 were rather different from those with phenol 3, as only the electronic properties influenced the outcome and phenylation was always the major pathway.
At this stage, the two aromatic nuclei of tetracycle 7 were electronically differentiated to allow for regioselective dichlorination of the more electron-rich indoline ring.
In both the molecules, the DFT-calculated atomic charges revealed that the more electron-rich atoms are C17, C18, C19, and C20; they are highly shielded atoms and appear at downfield (lower chemical shift).
Pyrazole derivatives with relatively more electron-rich aryl groups (4, 6 13) were obtained in moderate to good yields while those with relatively more electron-poor aryl groups (5, 14 18) in somewhat lower yields.
More electron-rich alkenes gave improved yields.
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Justyna Jupowicz-Kozak
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