1.

Amines are well known to be stronger bases and nucleophiles than alkcnes. Why do enamines, such as 1-dimethylaminocyclopentene, preferentially react with electrophiles at a double bond carbon rather than at nitrogen?

Answer»

The NITROGEN is stcrically HINDERED by alkyl subst.ituents.
Nitrogen is more elcctoncgativc than carbon.
The carbocation formed by electrophilic attack at C-2 is stabilized by `pi` BONDING with the lone PAIR of electrons on nitrogen.
Ammonium cations are less stable than carbocations.

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