Synthesis of Complexes with Abnormal “Protic” N‐Heterocyclic Carbenes |
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Authors: | Hanpeng Jin Tristan Tsai Yuan Tan Prof. F. Ekkehardt Hahn |
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Affiliation: | Institut für Anorganische und Analytische Chemie, Westf?lische Wilhelms‐Universit?t Münster, Corrensstrassee 30, 48149 Münster (Germany) |
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Abstract: | Neutral 4‐iodo‐N‐ethylimidazole 3 oxidatively adds to [Pt(PPh3)4] to give, in the presence of different tetraalkylammonium salts, complexes trans‐[ 4 ], trans‐[ 5 ], and trans‐[ 6 ] containing an anionic C4‐bound heterocycle with an unsubstituted ring‐nitrogen atom. Complex trans‐[ 4 ] reacts with the proton source NH4I under protonation of the ring‐nitrogen atom to produce complex trans‐[ 7 ]I which bears an NH,NR‐substituted aNHC ligand. The reaction of trans‐[ 4 ] with CH3I yields the complex trans‐[ 8 ]I which has a classical aNHC ligand with two alkylated ring‐nitrogen atoms. |
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Keywords: | alkylation N‐heterocyclic carbenes oxidative addition platinum protonation |
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