Question

$Trans-2-$butene $\underset{CHC{l}_3}{\overset{KOC{\left(C{H}_3\right)}_3}{\to }}$

Which of the following is the correct product obtained in the above reaction:

1) 1,1-dichloro cyclopropane

2) 2,2-dichloro butane

3) 2,2-dimethyl cyclopropane

Answer 1

During the reaction of trans-2-butene with potassium tert-butoxide in chloroform, dichlorocarbene is added to the carbon-carbon double bond to form a cyclopropyl ring.

Hence,1,1 -dichloro cyclopropane is the product.