Carbenes (Alkene insertion – Singlet carbene)

NOTE: Important charges and non-bonding electrons are shown throughout the animation except during the transition phase

Click the structures and reaction arrows in sequence to view the 3D models and animations respectively

Singlet carbenes such as this one here (remember that electron-rich substituents stabilize the singlet spin state), can add to alkenes in an entirely concerted manner, with the curly arrows written as shown. Because the process is concerted we expect that the geometry of the alkenes should be preserved in the product, so the reaction ought to be stereospecific. The two examples above show that this is indeed the case. It is more impressive that the Z-alkene gives the cis cyclopropane as this is less stable compared with the trans cyclopropane, and would change if it could.

Back to alkene insertion main page

P. de Frémont, N. Marion and S. P. Nolan, Coord. Chem. Rev., 2009, 253, 862–892.


How useful was this page?

Click on a star to rate it!

Average rating / 5. Vote count:

No votes so far! Be the first to rate this page.

As you found this page useful...

Follow us on social media!

We are sorry that this page was not useful for you!

Let us improve this page!

Tell us how we can improve this page (in your own language if you prefer)? If you would like a response, please include your email address e.g. [email protected]

Provided by the