Question

Draw the correct organic product for the following reaction. Show stereochemistry clearly.

Draw the correct organic product for the following reaction. Show stereochemistry clearly.

Answer 1

Concepts and reason

This problem is based on the partial reduction of alkynes with nickel boride as a catalyst. Nickel boride prepared from nickel acetate and sodium borohydride is called catalyst it is used for converting alkynes to alkenes, without reducing it further to alkanes.

Fundamentals

The catalytic reduction of alkynes with nickel boride is a stereospecific syn addition of hydrogen atoms. The product of the reaction is a cis alkene.

First write the reactant and product involved in the reaction.

The organic reaction of alkyne with ${{\rm{H}}_2}/{\rm{N}}{{\rm{i}}_2}{\rm{B}}\left( {{\rm{the}}{\kern 1pt} {\kern 1pt} {\kern 1pt} {\rm{P}} - 2{\kern 1pt} {\kern 1pt} {\kern 1pt} {\rm{catalyst}}} \right)$ is shown below:

Ans:

The organic product formed is as follows: