Kinetics and Catalysis, ( ISI ), Volume (55), No (4), Year (2014-8) , Pages (428-433)
Title : ( Synthesis, Characterization and Application of Cobalt Hydrogensulfate as a New Heterogeneous, Reusable and Efficient Catalyst in Onepot Synthesis of 14–aryl–14H–dibenzo[a,j]xanthenes and 1,8–dioxooctahydroxanthes )
Authors: Hossein Eshghi , Mohammad Rahimizadeh , melika eftekhar , Mehdi Bakavoli ,
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Abstract
Cobalt hydrogensulfate is synthesized and characterized by XRD, FTIR and TEM measurements. The efficiency of this readily available, cheap, nontoxic, heterogeneous and reusable catalyst is shown in the onepot preparation of aryl– and alkyl–14H–dibenzoxanthenes and 1,8–dioxooctahydroxanthene derivatives by cyclocondensation of substituted benzaldehydes and β–naphthol or 5,5–dimethyl–1,3–cyclohexanedione respectively. Among advantages of these methods are high yields, a clean reaction strategy, simple methodology, green conditions and easy workup.
