SEARCH Articles Figures Tables 3-substituted coumarin 3-substituted coumarin 4- Substituted coumarins, synthesis 4- substituted coumarin routes 7-Substituted 4-methyl coumarins Coumarins electrophilic substitution Pyron-ring substituted coumarins Substituted-7-Oxygenated Coumarins Synthesis of 3-Substituted Coumarins