ChemInform Abstract: Sulfamic Acid Catalyzed Solvent-Free Synthesis of 10-Aryl-7,7-dimethyl-6,7,8,10-tetrahydro-9H-[1,3]-dioxolo [4,5-b]xanthen-9-ones (IV) and 12-Aryl-9,9-dimethyl-8,9,10,12-tetrahydro-11H-benzo[a]xanthen-11-ones (VI).

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