Deactivating Groups
In organic chemistry, an electron withdrawing group (EWG) (deactivating group) is an atom or functional group that removes electron density from a conjugated π system via resonance or inductive electron withdrawal, thus making the π system more electrophilic. They have the opposite effect on electrophilicity as an electron donating groups (EDGs). When attached to a benzene molecule an electron withdrawing group makes electrophilic aromatic substitution reactions slower and more complex. Depending on their relative strengths, EWGs also determine the positions (relative to themselves) on the benzene ring where substitutions must take place; this property is therefore important in processes of organic synthesis.
Read more about Deactivating Groups: Categories, Mechanism
Other articles related to "deactivating groups":
... The selectivities observed with EDGs and EWGs were first described in 1892 and have been known as the Crum Brown-Gibson Rule. ...
Famous quotes containing the word groups:
“Belonging to a group can provide the child with a variety of resources that an individual friendship often cannot—a sense of collective participation, experience with organizational roles, and group support in the enterprise of growing up. Groups also pose for the child some of the most acute problems of social life—of inclusion and exclusion, conformity and independence.”
—Zick Rubin (20th century)