![Studies on the synthesis of heterocyclic compounds containing benzopyrone. Part 4. Synthesis of 4,10-dihydro-3-hydroxy-3-methyl-1H,3H-pyrano[4,3-b][1] benzopyran-10-one, the basic skeleton in fulvic acid]()
Studies on the synthesis of heterocyclic compounds containing benzopyrone. Part 4. Synthesis of 4,10-dihydro-3-hydroxy-3-methyl-1H,3H-pyrano[4,3-b][1] benzopyran-10-one, the basic skeleton in fulvic acidYamauchi, Masashige; Katayama, Sadamu; Nakashita, Yoshihiko; Watanabe, Toshio · Journal of the Chemical Society, Perkin Transactions 1 · 1985