Status: Bibliographieeintrag
Standort: ---
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| Online-Ressource |
Verfasst von: | Weitershaus, Katharina [VerfasserIn]  |
| Wadepohl, Hubert [VerfasserIn]  |
| Gade, Lutz H. [VerfasserIn]  |
Titel: | Titanium hydrazinediido half-sandwich complexes |
Titelzusatz: | highly active catalysts for the hydrohydrazination of terminal alkynes at ambient temperature |
Verf.angabe: | Katharina Weitershaus, Hubert Wadepohl, and Lutz H. Gade |
E-Jahr: | 2009 |
Jahr: | 12 May 2009 |
Umfang: | 9 S. |
Fussnoten: | Gesehen am 14.12.2022 |
Titel Quelle: | Enthalten in: Organometallics |
Ort Quelle: | Washington, DC : ACS Publ., 1982 |
Jahr Quelle: | 2009 |
Band/Heft Quelle: | 28(2009), 12, Seite 3381-3389 |
ISSN Quelle: | 1520-6041 |
Abstract: | Reaction of [Cp*Ti(NXylN)(NtBu)(NH2tBu)] with 1 molar equiv of diphenylhydrazine yielded the hydrazinediido complex [Cp*Ti(NXylN)(NNPh2)(NH2tBu)] (1a), whereas the orange pyridine adduct [Cp*Ti(NXylN)(NNPh2)(py)] (1b) was obtained by reacting the imide [Cp*Ti(NXylN)(NtBu)(NH2tBu)] with diphenylhydrazine in the presence of pyridine. The tert-butylamine coordinated to the metal center in 1a could be removed by heating the solid at 60 °C and 10−6 mbar for 72 h, yielding [Cp*Ti(NXylN)(NNPh2)] (1c). In the presence of pyridine or 4-dimethylaminopyridine (dmap) as neutral co-ligands the hydrazinediido complexes [Cp*Ti(NXylN)(NNMePh)(py)] (2a) and [Cp*Ti(NXylN)(NNMePh)(dmap)] (2b) as well as [Cp*Ti(NXylN)(NNMe2)(dmap)] (3) were prepared. Upon replacement of dmap by the weaker donor ligand pyridine in the synthesis of the pyridine adduct analogous to 3, a mixture of [Cp*Ti(NXylN)(NNMe2)(py)] (4a) and the dinuclear complex [Cp*2Ti2(NXylN)2(μ-η1,η1-NNMe2)(μ-η1,η2-NNMe2)] (4b) was obtained. Reaction of the dimethylhydrazinediido complex 3 with phenylacetylene gave the Markovnikov cycloadduct, which had sufficient lifetime to allow its 1H, 13C, and 15N NMR spectroscopic characterization in solution. All three hydrazinediido compounds 1a, 2a, and 3 were found to display remarkable activities in catalytic hydrohydrazinations at ambient temperatures. For catalyst loadings of 5 mol % complete conversions of the terminal alkynes and diynes with Markovnikov regioselectivities of over 99% selectivity were observed within 1 h. |
DOI: | doi:10.1021/om900155t |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext: https://doi.org/10.1021/om900155t |
| DOI: https://doi.org/10.1021/om900155t |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1827065273 |
Verknüpfungen: | → Zeitschrift |
Titanium hydrazinediido half-sandwich complexes / Weitershaus, Katharina [VerfasserIn]; 12 May 2009 (Online-Ressource)
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