(a)
Interpretation: Under conditions, a plausible mechanism for the given conversion has to be proposed.
Concept Introduction:
Benzyne mechanism: A strong base abstract the proton from ortho to the leaving group in
Example:
Chloro benzene is converted to a phenol in the presence of base by the use of benzyne mechanism.
The mechanism of phenol sequence of arrow pushing pattern is given.
Enolate formation:
For any given transformation, the following mandatory observations have to be made clear to predict the synthetic scheme:
- Observe whether there is any change in the carbon skeleton.
- Observe whether there is any change in the location of the functional group.
- Predict the synthetic scheme in such a way that these two observations have to be achieved within the minimum chemo selective steps.
(b)
Interpretation: The structure of the side product has to be proposed.
Concept Introduction:
Enolate formation:
For any given transformation, the following mandatory observations have to be made clear to predict the synthetic scheme:
- Observe whether there is any change in the carbon skeleton.
- Observe whether there is any change in the location of the functional group.
- Predict the synthetic scheme in such a way that these two observations have to be achieved within the minimum chemo selective steps.
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