Question

Is ketone preoared by rosenmund reaction, stephen reaction and reduction of ester ? What are the reactions?

Answer 1

Dear Student,

Ketones cannot be prepared from Stephen's reaction, Rosenmund reaction and reduction of esters. These methods are used for the preparation of aldehydes only.
$$\begin{gathered} \mathrm{Stephen}\text{'}\mathrm{s}\mathrm{reduction}: \\ \mathrm{R}-\mathrm{C}\equiv \mathrm{N}\underset{{\mathrm{H}}_2\mathrm{O}/{\mathrm{H}}^{+}}{\overset{\mathrm{Sn}/\mathrm{HCl}}{\to }}\mathrm{RCHO} \\ \mathrm{Rosenmund}\text{'}\mathrm{s}\mathrm{reaction}: \\ \mathrm{RCOCl}\underset{\mathrm{Sulphur}}{\overset{\mathrm{Pd}/{\mathrm{BaSO}}_4}{\to }}\mathrm{RCHO}+\mathrm{HCl} \\ \mathrm{Reduction}\mathrm{of}\mathrm{esters}: \\ \mathrm{RCOOR}\text{'}\stackrel{\mathrm{DIBAL}-\mathrm{H}}{\to }\mathrm{RCHO}\hspace{0.17em}+\mathrm{R}\text{'}\mathrm{OH} \end{gathered}$$