Summary
The behaviour of 7-hydroxy-coumarin indicates that there exists a double bond between 7 and 8 positions. But 7-hydroxy-4: 8-dimethyl-coumarin couples with diazocompounds and undergoes mercuration in the benzene nucleus. Its acetyl derivative undergoes the Fries migration and its allyl ether the Claisen transformation. It is therefore concluded that the nuclear double bonds are not fixed and are capable of assuming alternative positions.
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Rangaswami, S., Seshadri, T.R. Fixation of the aromatic double bonds in the coumarin ring system. Proc. Indian Acad. Sci. (Math. Sci.) 7, 8–12 (1938). https://doi.org/10.1007/BF03045375
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DOI: https://doi.org/10.1007/BF03045375