M.  Thangaraj, Bhojgude, S. Suresh, Bisht, R. H., Gonnade, R. G., and Biju, A. T., ?Diels-alder reaction of tropones with arynes: synthesis of functionalized benzobicyclo[3.2.2]nonatrienones?, Journal of Organic Chemistry, vol. 79, no. 10, pp. 4757?4762, 2014.