using-carbenes-cyclopropanation-is-stereospecific-what-does-the-stereospecificit

Question

The cyclopropanation reaction between an alkene and a singlet carbene is stereospecific. What does the stereospecificity of the reaction imply about its mechanism?

Accepted Answer

It implies that the mechanism is concerted.

Answer

It shows that the mechanism is not concerted.

Answer

It says that the mechanism is very hard to draw.

Answer

It says that the mechanism involves two steps.

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The cyclopropanation reaction between an alkene and a singlet carbene is stereospecific. What does the stereospecificity of the reaction imply about its mechanism?