Type of Publication: | Journal article |
Author: | Szesni, Normen; Drexler, Matthias; Weibert, Bernhard; Fischer, Helmut |
Year of publication: | 2007 |
Published in: | Zeitschrift für Naturforschung B ; 62 (2007), 3. - pp. 346-356. - ISSN 0932-0776. - eISSN 1865-7117 |
DOI (citable link): | https://dx.doi.org/10.1515/znb-2007-0307 |
Summary: |
The reaction of [(CO)5Cr(THF)] with propynethioic acid amides, R–C≡C–C(=S)NMe2 (R = H, SiMe3), yields the thioamide complexes [(CO)5Cr–S=C(NMe2)C≡C–H] (1a) and [(CO)5Cr–S=C(NMe2)C≡C–SiMe3] (1b). Treatment of solutions of 1a or 1b with methyllithium generates, via deprotonation or desilylation, the lithium salt Li[(CO)5Cr–S=C(NMe2)C≡C] (2). On filtration over silica, 2 is readily reprotonated. Complex 1a is inert towards methanol, however, adds diethylamine across the C≡C bond to give the thioacrylamide complex [(CO)5Cr–=C(NMe2)C(H)=C(H)NMe2] (3). Thiourea displaces the thioamide ligand to give [(CO)5Cr–S=C(NH2)2] (4). Complex 1a reacts with half an equivalent of diethylaminopropyne in a three-component coupling to form the homobinuclear complex [(CO)5Cr–=C(NEt2)–C(CH3)=C(H)–C(H)=C(NMe2)–C≡C–C(NMe2)=S–Cr(CO)5] (5) in high yield. The solid state structures of complexes 1a and 5 were established by X-ray structural analyses.
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Subject (DDC): | 540 Chemistry |
Bibliography of Konstanz: | Yes |
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SZESNI, Normen, Matthias DREXLER, Bernhard WEIBERT, Helmut FISCHER, 2007. Ethynylthioamide Complexes : Synthesis, Reactivity and an Unusual Coupling Reaction with Diethylaminopropyne. In: Zeitschrift für Naturforschung B. 62(3), pp. 346-356. ISSN 0932-0776. eISSN 1865-7117. Available under: doi: 10.1515/znb-2007-0307
@article{Szesni2007Ethyn-22895, title={Ethynylthioamide Complexes : Synthesis, Reactivity and an Unusual Coupling Reaction with Diethylaminopropyne}, year={2007}, doi={10.1515/znb-2007-0307}, number={3}, volume={62}, issn={0932-0776}, journal={Zeitschrift für Naturforschung B}, pages={346--356}, author={Szesni, Normen and Drexler, Matthias and Weibert, Bernhard and Fischer, Helmut} }