SCHEDULED MAINTENANCE
3-(4-p-Tolyloxybut-2-ynyloxy)[1]benzopyran-2-one (1), when refluxed in chlorobenzene, ethyl benzene, or xylene, gave exclusively 1-(p-tolyloxymethyl)pyrano[2,3-c][1]benzopyran-5(3H)-one (2), whereas through an ionic or radical pathway 2-methyl-1-(p-tolyloxymethyl)furo[2,3-c][1]benzopyran-4-one (3) was the exclusive product.
K. C. Majumdar, R. N. De, A. T. Khan, S. K. Chattopadhyay, K. Dey and A. Patra, J. Chem. Soc., Chem. Commun., 1988, 777 DOI: 10.1039/C39880000777
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