Iron/N-doped graphene nano-structured catalysts for general cyclopropanation of olefins
Abhijnan Sarkar1, Dario Formenti2, Francesco Ferretti1
1Dipartimento di Chimica - Università degli Studi di Milano , Via C. Golgi 19 , 20133 Milano , Italy .
Abstract:
The first examples of heterogeneous Fe-catalysed cyclopropanation reactions are presented. Pyrolysis of in situ-generated iron/phenanthroline complexes in the presence of a carbonaceous material leads to specific supported nanosized iron particles, which are effective catalysts for carbene transfer reactions. Using olefins as substrates, cyclopropanes are obtained in high yields and moderate diastereoselectivities. The developed protocol is scalable and the activity of the recycled catalyst after deactivation can be effectively restored using an oxidative reactivation protocol under mild conditions.
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