Synthesis, structure and benzannulation of chalcogen-tethered Fischer carbene complexes
| Autor: | Amitabha Sarkar, Vedavati G. Puranik, Debasis Hazra, Dilip K. Sinha-Mahapatra |
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| Rok vydání: | 2004 |
| Předmět: |
Stereochemistry
Chemistry Transition metal carbene complex Organic Chemistry General Medicine Alkylation Conjugated system Biochemistry Medicinal chemistry Inorganic Chemistry chemistry.chemical_compound Aminolysis Materials Chemistry Alkoxy group Physical and Theoretical Chemistry Carbene Dimethylamine Methyl iodide |
| Zdroj: | Journal of Organometallic Chemistry. 689:3501-3512 |
| ISSN: | 0022-328X |
| Popis: | Addition of PhSH–NEt3 or PhSeNa to PhCCC(OC2H5)M(CO)5 [M = Cr or W] afforded stable, β-chalcogenide tethered conjugated carbene complexes 3–6 as a mixture of E,Z-isomers. The Z-configuration was ascribed to those isomers that readily yield cyclometallated complexes. Aminolysis with methylamine yielded corresponding amino carbene complexes as mixtures of E,Z-isomers. Alkylation by methyl iodide afforded separable E,Z-isomers of dimethylamino complexes. One-step aminolysis of ethoxy carbene complexes with dimethylamine furnished only the Z-isomer of the dimethylamino complex. The Z-isomer of dimethylamino carbene complexes yielded cyclometallated products on warming. Representative crystal structures of these complexes confirm isomer assignments. Only E-isomers of the S or Se-tethered ethoxy complexes undergo benzannulation reaction with alkynes, with loss of chalcogenide atom. |
| Databáze: | OpenAIRE |
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