Question

Among the following structures, which will show the most stable enamine formation ?

(Where Me is –CH₃)

Answer 1

due to less steric interaction between -COOH and -Me group in Structure (1). It is most stable among given enamine structures.

Answer 2

Correct option is

All these enamines are interconvertible through their resonating structures. So most stable form is ‘C’ due to steric factor.