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Chromium Complex Catalyzed Synthesis of Spirocyclopropanes from Diaryl Diazo Compounds – Direct NMR-Spectroscopic Observation of a Carbene Complex Intermediate

✍ Scribed by Jürgen Pfeiffer; Martin Nieger; Karl Heinz Dötz

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
821 KB
Volume
1998
Category
Article
ISSN
1434-193X

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✦ Synopsis

The [2 + 1] cycloaddition reaction of electron-rich alkenes such as enol ethers with 9-diazo-9H-fluorene (1) is efficiently catalyzed by pentacarbonyl(η 2 -cis-cyclooctene)chromium(0) (2). This cyclopropanation reaction shows a pronounced preference for electron-rich C=C bonds, as demonstrated by the regioselective reactions of allyl vinyl ether and 2vinyloxyethyl acrylate; the [2 + 1] cycloaddition proceeds via the carbene complex intermediate 13, which has been detected by 13 C-NMR spectroscopy in the course of the

📜 SIMILAR VOLUMES

ChemInform Abstract: Reactions of Comple
ChemInform Abstract: Reactions of Complex Ligands. Part 78. [2 + 1] Cycloadditions of Diazoalkanes to Enol Ethers Catalyzed by Chromium Complexes — The First Direct Spectroscopic Observation of a Carbene Complex Intermediate.
✍ J. PFEIFFER; K. H. DOETZ 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 31 KB 👁 1 views

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