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| Titel: |
Reactions of Cyclopropylcarbene-Chromium Complexes |
| Auteur: |
Herndon, James W. Tumer, Seniz U. McMullen, Leonard A. Matasi, Julius J. Schnatter, Wayne F. K. Daitch, Charles E. |
| Verschenen in: |
Comments on inorganic chemistry |
| Paginering: | Jaargang 10 (1990) nr. 1 pagina's 1-24 |
| Jaar: |
1990 |
| Inhoud: |
The reactions of Fischer-carbene complexes containing a cyclopropane ring as one of the carbene substituents have been examined. Reaction of these complexes with alkynes leads to cyclopentenone derivatives in good-excellent yields. The reaction proceeds through a cyclopentadienone intermediate, which is reduced to the corresponding cyclopentenone derivative by chromium (0) and water. The cyclopropane ring opens at a relatively late stage of the reaction with alkynes, and does not occur until after insertion of the alkyne. Cyclopropylcarbene complexes having an alkenyl substituent at the 2-position of the cyclopropane ring undergo facile ring expansion reactions. The cyclopropane ring-opening steps of these reactions resemble classical pericyclic organic reactions, and thus the reactivity of these systems has been attributed to orbital symmetry considerations. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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