Studies on 4-Hydroxycoumarins. XV. Synthesis of Some 3-Thio-4-hydroxycoumarins from 3-Bromo-4-hydroxycoumarin
Hugh R. Eisenhauer, Karl Paul Link
J. Am. Chem. Soc., 1954, 76 (6), pp 1647–1649
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http://pubs.acs.org/doi/abs/10.1021/ja01635a054