1. (a) Finley, K. T. In The Chemistry of the Quinonoid Compounds; Patai, S., Ed.; Wiley: London, 1974; Part 2, p. 877;
2. (b) Finley, K. T. In The Chemistry of the Quinonoid Compounds; Vol. 2; Patai, S.; Rappoport, Z., Eds.; Wiley: London, 1988; Part 1, p. 537.
3. (a) Hirao, T.; Fukuhara, S. J. Org. Chem. 1998, 63, 7534;
4. (j) McKillop, A.; Ray, S. J. Synthesis 1977, 847;
5. (k) Domagala, S.; Steglinska, V.; Dziegiec, J. Monatsh. Chem. 1998, 129, 761.