Reactions of dicobalt octacarbonyl and related compounds with gem-dihalides
| Autor: | Michelle D. Millar, Dietmar Seyferth |
|---|---|
| Rok vydání: | 1972 |
| Předmět: |
Olefin fiber
Dimer Organic Chemistry chemistry.chemical_element Halogenation Photochemistry Biochemistry Medicinal chemistry Indirect evidence Inorganic Chemistry chemistry.chemical_compound Bromodiphenylmethane chemistry Materials Chemistry Physical and Theoretical Chemistry Dicobalt octacarbonyl Cobalt Vicinal |
| Zdroj: | Journal of Organometallic Chemistry. 38:373-383 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/s0022-328x(00)83340-9 |
| Popis: | Dicobalt octacarbonyl and some of its derivatives (NaCo(CO)4, Co4(CO)12, Hg[Co(CO)4]2, [Co(CO)3PPh3]2, NaCo(CO)3PPh3) react with activated gem-dihalides, R2CX2, such as dichlorodiphenylmethane, 9,9-dihalofluorenes and dimethyl dibromomalonate, to give the ‘dimer’ olefin, R2CCR2. The course of this conversion involves formation of the coupling product, R2XCCXR2, followed by dehalogenation of the latter. These separate steps have been confirmed for activated monohalides (bromodiphenylmethane, 9-bromofluorene, dimethyl bromomalonate) which were readily coupled by cobalt carbonyls, and for activated vicinal dihalides (D,L and meso-dibromostilbene, 9,9′-dichlorobisfluorenyl) which cobalt carbonyls readily dehalogenated. A radical mechanism is favored for these processes, and indirect evidence in its favor is presented. |
| Databáze: | OpenAIRE |
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