Unsuitable alkenes are tetrasubstituted alkenes and alkenes with strongly electron withdrawing groups.
2.
For electron withdrawing groups the double bonds of the product avoid the substituents.
3.
Despite nonlinearity in benzylic SN2 reactions, electron withdrawing groups could either accelerate or retard the reaction.
4.
If there is an electron withdrawing group on the substituent, then it decreases the rate of migration.
5.
Electron withdrawing groups such as fluorine increase rate by decreasing LUMO energy and the HOMO-LUMO gap.
6.
The carbon atom of a carbonyl bears a partial positive charge enhanced by neighboring electron withdrawing groups like carbonyl itself.
7.
Studies have shown that the selectivity can also be changed by the presence of electron donating and electron withdrawing groups.
8.
Electron donating groups ( EDG ) favor the norcaradiene, while electron withdrawing groups ( EWG ) favor the cycloheptatriene.
9.
The Buchner ring expansion is encouraged to open to the desired product by placing electron withdrawing groups on the carbon added.
10.
The para-substituted phenyl methanols conform that electron withdrawing groups help to stabilize the negative charge built up in the carbanionic intermediate.
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