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Type of Publication: | Journal article |
Author: | Fischer, Helmut; Troll, Carsten |
Year of publication: | 1993 |
Published in: | Chemische Berichte ; 126 (1993), 11. - pp. 2373-2378. - ISSN 0009-2940. - eISSN 1099-0682 |
DOI (citable link): | https://dx.doi.org/10.1002/cber.19931261104 |
Summary: |
Coupling of Cyanamides with a Carbyne Ligand – Formation of η2-(C,N)-Imidazolium Complexes and Ansa-Carbene Complexes†
Dicarbonyl(cyclopentadienyl)(phenylcarbyne)manganese complexes [Cp(CO)2Mn≡CPh]+X- (1-X) (X = BF4, BCl4) react with dimethyl- (2a), diethyl- (2b), and diisopropylcyanamide (2c) in five-fold excess by a head-to-tail cyclization of two cyanamides with the carbyne ligand to give η2-(C,N)-imidazolium complexes (3a–c–X). As byproducts ansa-amino(alkylide-neamino)carbene complexes (4a–c) are formed in which a N=C(Ph) group bridges the carbene carbon and the Cp ring. With increasing excess of the cyanamide the product ratio 3-X: 4 increases. Among the products of the reaction of 1-X with the cyanamides N≡CNR2 [NR2 = N(iBu)2, N(Bzl)2, N(Me)Ph] no imidazolium complexes 3-X are detected, only ansa-carbene complexes 4 are isolated. PMe3/H2O or pyridine/H2O displaces the heterocyclic ligand from 3a-BF4. The structure of 3a-BF4 is established by an X-ray analysis. |
Subject (DDC): | 540 Chemistry |
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FISCHER, Helmut, Carsten TROLL, 1993. Verknüpfung von Cyanamiden mit einem Carbinliganden – Bildung von η2-(C,N)-Imidazolium- und Ansa-Carben-Komplexen†. In: Chemische Berichte. 126(11), pp. 2373-2378. ISSN 0009-2940. eISSN 1099-0682. Available under: doi: 10.1002/cber.19931261104
@article{Fischer1993Verkn-23405, title={Verknüpfung von Cyanamiden mit einem Carbinliganden – Bildung von η2-(C,N)-Imidazolium- und Ansa-Carben-Komplexen†}, year={1993}, doi={10.1002/cber.19931261104}, number={11}, volume={126}, issn={0009-2940}, journal={Chemische Berichte}, pages={2373--2378}, author={Fischer, Helmut and Troll, Carsten} }