Rhodium-catalysed [2 + 2 + 2]-cycloadditions of acetylenes
- 1 January 1988
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 6,p. 1357-1364
- https://doi.org/10.1039/p19880001357
Abstract
Wilkinson's catalyst [(PPh3)3RhCl](0.5–2 mol%) catalyses the chemospecific [2 + 2 + 2]-cycloaddition of hepta-1,6-diynes with monoynes to give polysubstituted benzene derivatives in moderate to good yield. The reaction is favoured by polar solvents such as ethanol and occurs at 0–78 °C. Several examples of intramolecular [2 + 2 + 2]-cycloadditions of triynes are described and a mechanism that accounts for the chemospecificity and observed variations in rates of reaction is discussed.Keywords
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