[1]   R. E. Kirk and D. F. Othmer, “Encyclopedia of Chemical Technology,” 5th Edition; John Wiley & Sons Ltd., Chichester, 2007.

[2]   J. R. S. Hoult and M. Paydt, “Pharmacological and Biochemical Actions of Simple Coumarins: Natural Products with Therapeutic Potential,” General Pharmacology, Vol. 27, No. 4, 1996, pp. 713-722. doi:10.1016/0306-3623(95)02112-4

[3]   E. M. Agostinha, R. Matos, C. C. S. Sousa, et al., “Energetics of Coumarin and Chromone” The Journal of Physical Chemistry B, Vol. 113, No. 32, 2009, pp. 11216-11221. doi:10.1021/jp9026942

[4]   J. Preat, D. Jacquemin, et al., “Theoretical Investigation of Substituted Anthraquinone Dyes,” Journal of Chemical Physics, Vol. 415, No. 20, 2005, pp. 1736-1743. doi:10.1063/1.1764497

[5]   B. A. Chauder, C. C. Lopes, R. S. C. Lopes, A. J. M. da Silva and V. Snieckus, “Phenylboronic Acid-Mediated Synthesis of 2H-Chromenes,” Synthesis, Vol. 1998, No. 3, 1998, pp. 279-282. doi:10.1055/s-1998-2042

[6]   K. A. Parker and T. L. Mindt, “Electrocyclic Ring Closure of the Enols of Vinyl Quinones. A 2H-Chromene Synthesis,” Organic Letters, Vol. 3 No. 24, 2001, pp. 3875-3878. doi:10.1021/ol0167199

[7]   I. H. Updergraff and H. G. Cassidy, “Electron Exchange—Polymer II. Vinylhydroquinone Monomer and Polymer,” Journal of the American Chemical Society, Vol. 71, No. 407, 1949, pp. 407-410. doi:10.1021/ja01170a010

[8]   S. Patai, “The Chemistry of Functional Groups. The Chemistry of Quinoid Compounds. Part 2,” 1st Edition, John Wiley & Sons Ltd., Chichester, 1974.

[9]   D. Burton and D. Ollis “Comprehensive Organic Chemistry. (The Synthesis and Reactions of Organic Compounds),” 1st Edition, Pergamon Press, Oxford, 1979.

[10]   R Murray, J Mendez and S. Brown, “The Natural Coumarins,” John Wiley & Sons, Chichester, 1997.

[11]   E. Cingolani, “Idrolisi del Ciclo Cumarinico e Transformazione cis—Trans Degli Acidi O-Ossicinnamici,” Gazzeta, Vol. 89, No. 5, 1959, pp. 195-1998.

[12]   E. Cingolani, “Trasformazione Degli Acidi Cumárico (Trans O-Ossicinnamici) Nelle Cumarina Corrispondenti,” Gazzetta, Vol. 46, No. 9, 1959, pp. 999-1008.

[13]   D. Bihari and K. Krishna, “Action of Sodium Sulphite on Coumarins,” Journal of the American Chemical Society, Vol. 46, No. 3, 1924, pp. 554-564.

[14]   R. Adams and T. E. Bockstahler, “Preparation and Reactions of O-Hydroxycinnamic Acids and Esters,” Journal of the American Chemical Society, Vol. 74, No. 21, 1952, pp. 5346-5348. doi:10.1021/ja01141a038

[15]   F. D. Dodge, “Some Derivatives of Coumarin,” Journal of the American Chemical Society, Vol. 38, No. 2, 1916, pp. 446-457. doi:10.1021/ja02259a030