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Updated: Jun 22, 2025

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
Mesoionic Janus-Type Dicarbene: Complexes, Adducts, and Catalytic Studies
Jia Nuo Leung1, Han Vinh Huynh1
1Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore, 117453, Republic of Singapore.
Abstract:
The preparations of homo- and hetero-bimetallic complexes as well as thiourea and selenourea derivatives of a mesoionic Janus-type N-heterocyclic dicarbene (diNHC) are reported. Analogues of its monocationic intermediate NHC have also been obtained for comparison. Using the main group adducts, the π-acceptor properties of both NHCs were determined using low temperature 77Se NMR spectroscopy completing their stereoelectronic profiling. Moreover, catalytic investigations reveal that the mesoionic dipalladium Janus-diNHC complex can be used in the sequential C2- and C5-arylation of 1-methylpyrrole for the preparation of non-symmetrical 2,5-diarylpyrroles.
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