JEE Main Chemistry question

Which of the following is an enamine?

(A)Cyclohexylidene--phenylamine (a cyclohexane ring, exocyclic )
(B)-(cyclohex--en--yl)azepane (a cyclohexene ring whose alkene carbon is bonded directly to the nitrogen of a saturated 7-membered ring amine)Correct
(C)Cyclohexylamine ()
(D)-dicyclohexylcarbodiimide ()

Answer: (B)

Solution

An enamine is, by definition, an -unsaturated amine in which the nitrogen is bonded directly to one of the carbons of a C=C double bond (the vinylogous analogue of an amine). Option (a) instead has the nitrogen DOUBLE-bonded to carbon () — this is the defining feature of an imine (here, a Schiff

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Question ID VK-150393