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Gaël Ung, Dr. Daniel Mendoza-Espinosa, Dr. Jean Bouffard and Prof. Guy Bertrand A Stable Acyclic Ligand Equivalent of an Unstable 1,3-Dithiol-5-ylidene Angewandte Chemie International Edition 50

Article first published online: 6 APR 2011 | DOI: 10.1002/anie.201100420

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Substitutes you can rely on: Mesoionic carbenes (MICs) are not always stable. However, the acyclic ethynylcarbamodithioate 2 formed (instead of the corresponding MIC) by deprotonation of dithiolium salt 1 underwent cyclization to its precursor under acidic conditions and reacted with a variety of transition-metal centers to yield robust MIC complexes 3; (see scheme; Tipp=2,4,6-triisopropylphenyl).

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