In chemistry, an electron-wí†hdráwing group (EWG) is a substituent that has some of the following kinetic and thermodynamic implications:
with regards to electron transfer, electron-wí†hdráwing groups enhance the oxidizing power tendency of the appended species. Tetracyanoethylene is an oxidant because the alkene is appended to four cyano substituents, which are electron-wí†hdráwing.
with regards to acid-base reactions, acids with electron-wí†hdráwing groups species have low acid dissociation constants. For EWG's attached to benzene, this effect is described by the Hammett equation, which allows EWGs to be discussed quantitatively.
with regards to nucleophilic substitution reactions, electron-wí†hdráwing groups are susceptible to attack by weak nucleophiles. For example, compared to chlorobenzene, chlorodinitrobenzene is susceptible to reactions that displace chloride.
electron-wí†hdráwing substituents enhance the Lewis acidity. Relative to methyl, fluorine is a strong EWG. It follows that boron trifluoride is a stronger Lewis acid than is trimethylborane.
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