SEARCH Articles Figures Tables 4H-Chromen-4-one 7 - -2H chromen-2-one Benzo chromen-6-ones synthesis Chromene-5-ones Functionalized chromen-5-ones H-Chromen-2-one One-pot multicomponent -3,4dihydro-2-oxo-2//-chromene-3-carboxylate Pyrano chromen-5-ones