Abstract
Flash vacuum pyrolysis of the stable ylides 5, readily available by conjugate addition of ylides 3 to alpha,beta-unsaturated ketones 4, results in an intramolecular Wittig reaction with the delta-carbonyl to give cyclobutenes which under the conditions involved undergo electrocyclic ring-opening to afford the synthetically useful 1,3-dienes 7.
Original language | English |
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Pages (from-to) | 1235-1236 |
Number of pages | 2 |
Journal | Synlett |
Publication status | Published - Aug 1999 |
Keywords
- phosphorus ylides
- Wittig reactions
- flash pyrolysis
- gas-phase chemistry
- cycloadditions