A NEW ACCESS TO 1,8-DIOXOOCTAHYDROXANTHENES USING YTTRIUM(III) NITRATE HEXAHYDRATE AND TIN(II) CHLORIDE DIHYDRATE AS EFFECTIVE AND REUSABLE CATALYSTS

摘要

An efficient and environmentally adapted synthesis of xanthene derivatives by conden-sation of a wide range of aryl aldehydes and cyclohexane-1,3-diones in the presence of catalytic amount of yttrium(III) nitrate hexahydrate and tin(II) chloride dihydrate is demonstrated.