Question

What is the product of the reaction of $2$$-butene$ and $diazomethane$?

• A. $1,3$$-dimethylcyclopropane$
• B. $1,2$$-dimethylcyclopropane$
• C. $1,1$$-dimethylcyclopropane$
• D. $Methylcyclopropane$

Answer 1

Answer: (B)

$1,2$$-dimethylcyclopropane$

Diazomethane $C{H}_2{N}_2$ is a source of carbene which is added to the alkene to give cyclopropyl derivatives.

Diazomethane when reacts with 2-butene it forms a cyclic compound containing diazonium linkage in the ring which then evolve nitrogen gas to form $1,2-dimethylcyclopropane.$