electron-withdrawing group

In the absence of an electron-withdrawing group, the final product is the α-hydroxyphosphonate 3a and 3b.

When the multiple bond is polarized by an electron-withdrawing group, selective addition results.

Some interesting results were that electron-withdrawing groups on the diene decreased the rate of reaction.

E" is used in organic chemistry to denote an electron-withdrawing group. "

If next to an electron-withdrawing group, conjugate addition (Michael addition) occurs.

Hammett originally used a series of anilines with electron-withdrawing groups for the bases.

The opposite effect is seen when an electron-withdrawing group (such as nitro) is attached.

Strategically placed electron-withdrawing groups in the starting material can render this process essentially irreversible.

They are strong electron-withdrawing groups that increase the acidity of alpha-protons on the aromatic ring.

An additional stabilization is achieved by the trifluoromethyl group as a strong electron-withdrawing group.

The carboxyl is the better electron-withdrawing group, causing the β-carbon to be most electrophilic.

Suitable choice of electron-withdrawing groups allows selective 4-substitution of the pyrrole ring.

The substituent R next the amine methylene bridge is an electron-withdrawing group.

Alkenes with electron-withdrawing groups commonly bind strongly to low-valent metals.

Fluorine is a good electron-withdrawing group in terms of synthetic accessibility and biological inertness.

Therefore, these electron-withdrawing groups are meta directing.

Electron-withdrawing groups, such as groups with fluorine substitution, are necessary to stabilize these compounds.

Deprotonation of 1 by base leads to carbanion 2 stabilized by its electron-withdrawing groups.

Most sulfilimines are N-substituted with electron-withdrawing groups.

They lead to the models of resonance structures for an electron-withdrawing group and electron-releasing group on benzene.

Stabilizing the initially formed radical with electron-withdrawing groups provides access to more stable 6-endo cyclization products preferentially.

In other words, the electron-withdrawing groups resulted in "less unfavorable" electrostatic interactions in the ground state.

Electron donating groups on the imine facilitate this step, while electron-withdrawing groups impede the attack.

Electron-withdrawing groups in the N3 and C5 positions stabilize the carbenes more than electron-donating groups.