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Fluoroboric acid adsorbed on silica-gel (HBF4–SiO2) as a new, highly efficient and reusable heterogeneous catalyst for thia-Michael addition to α,β-unsaturated carbonyl compounds

Materials ScienceReusable Heterogeneous CatalystChemical EngineeringEngineeringFluoroboric AcidHeterogeneous CatalysisThia-michael AdditionOrganic ChemistryCatalysisMolecular CatalysisChemistryCatalyst PreparationCatalytic Synthesis