Silver(I) ion catalysed intramolecular cyclisation of R′C6H4C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CCOC6H3(OH)R (1a–d) at room temperature gives the corresponding aurone (2a–d) as the major product with a trace amount of the flavone; compounds (1a–d) could be prepared by the addition of the corresponding lithium acetylide (4a–b) to the substituted salicyl aldehyde (5a–c), followed by MnO2 oxidation.
T. Jong and S. Leu, J. Chem. Soc., Perkin Trans. 1, 1990, 423 DOI: 10.1039/P19900000423
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