Examples of 'electron-withdrawing' in a sentence
Meaning of "electron-withdrawing"
Electron-withdrawing is a term used in chemistry to describe a molecule or functional group that has a strong tendency to attract electrons in a chemical reaction. Electron-withdrawing groups typically have a partial negative charge and can influence the reactivity of a compound
How to use "electron-withdrawing" in a sentence
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electron-withdrawing
Suitable electron-withdrawing groups are mentioned above.
A positive value of σ indicates an electron-withdrawing group.
The electron-withdrawing group is preferably positioned a to the triple bond.
These groups are all electron-withdrawing groups.
Z is an electron-withdrawing group which may be absent in one or both occurrences.
Preferred blocking groups are electron-withdrawing groups.
The electron-withdrawing component is typically an electron-withdrawing anion source compound.
The nitro group is also strongly electron-withdrawing.
Y is an electron-withdrawing substituent that stabilizes the conjugate against premature release.
Preferred blocking groups arc electron-withdrawing groups.
Exemplary electron-withdrawing groups include cyano, alkoxycarbonyl and nitro groups.
The peptide moiety is bonded to the electron-withdrawing group.
The electron - withdrawing component is typically an electron-withdrawing anion source compound.
Phenol derivatives with at least one electron-withdrawing substituent are preferred.
An additional stabilization is achieved by the trifluoromethyl group as a strong electron-withdrawing group.
See also
Fluorine is a good electron-withdrawing group in terms of synthetic accessibility and biological inertness.
Typically the substituent on the indolyl group is an electron-withdrawing group.
An electron-withdrawing moiety is a chemical group which draws electrons away from a reaction centre.
Deactivating groups such as other nitro groups have an electron-withdrawing effect.
The substituents used may comprise electron-withdrawing or electron-donating atoms or organic radicals.
It has been suggested in reference 4 that effective blocking groups are electron-withdrawing groups.
The said group selected from among the electron-withdrawing groups is advantageously a halogen.
Leaving groups of bleach activators for relatively low-pH washing are suitably electron-withdrawing.
The electron-withdrawing anion source compound serves as a source or a precursor for the respective anion.
The skilled person will be aware of other appropriate electron-withdrawing groups.
The electron-withdrawing anion source compound typically is volatile or gaseous at the intended calcination temperature.
Electron-donating groups promote decarbonylation while electron-withdrawing groups favour cycloelimination.
The highly electron-withdrawing effect of this nitrile group renders this hydrogen markedly more acidic.
Hammett originally used a series of anilines with electron-withdrawing groups for the bases.
The first electron-withdrawing group and the second electron-withdrawing group may be the same or different.
The activator-support may include a solid oxide treated with an electron-withdrawing anion.
The bond is made between the electron-withdrawing group and any portion of the peptide.
The solid oxide material is chemically-treated by contacting it with an electron-withdrawing anion source.
In that case the electron-withdrawing groups Z are ester groups.
It should be noted that the aromatic nucleus contained only electron-withdrawing groups in this example.
Preferably, the electron-withdrawing moiety is a halogen.
The solid oxide can be optionally calcined prior to contacting the electron-withdrawing anion source.
Suitable electron-withdrawing components / anions were discussed previously.
The aromatic, carbocyclic anionic groups may be substituted by various groups including electron-withdrawing groups.
Those substituents which exhibit a lesser inductive electron-withdrawing effect than hydrogen possess negative sigma constants.
However, the nitrogen-containing aromatic ring is preferably unsubstituted or substituted with electron-withdrawing groups.
Concentration of Electron-Withdrawing Anions.
Exemplary non-coordinating anion precursors include boron compounds that include strong electron-withdrawing groups.
The nitro-group is an electron-withdrawing group.
The electron-withdrawing ester substituent, however, lacks this stabilization ability.
Electrophilic carbon-carbon double bonds substituted with a single electron-withdrawing group are generally preferred.
Electron-withdrawing groups stabilize the oxazolidine ring of the pseudo-proline.
The eight bromo groups in CuTCPBr provide moderately strong electron-withdrawing groups to the tetraphenylporphyrin structure.
This is the electron-withdrawing inductive effect, also known as the formula 1 effect.
The chemically-treated solid oxide can comprise a solid oxide treated with an electron-withdrawing anion.
