title: Facile Preparation of Flavinium Organocatalysts.
abstract: We developed a safe, simple, inexpensive, and environmentally benign method for preparing N(5)-ethylated flavinium organocatalysts without using hazardous reagents or inert conditions as previously required. 5-Ethyl-3-methyllumiflavinium cation was prepared from its reduced form by NaNO2-free aerobic oxidation, which was subsequently extracted onto commercial cation-exchange resins under NaClO4-free conditions. The resulting resin-immobilized flavinium salts were found to be effective organocatalysts for aerobic oxidation reactions.
authors.affiliation: Department of Applied Chemistry, Tokushima University, Minamijosanjima, Tokushima, 770-8506, Japan.
authors.forename: Yukihiro
authors.identifier: http://orcid.org/0000-0003-1000-5799
authors.initials: Y
authors.lastname: Arakawa
authors.affiliation: Department of Applied Chemistry, Tokushima University, Minamijosanjima, Tokushima, 770-8506, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Oonishi
authors.affiliation: Department of Applied Chemistry, Tokushima University, Minamijosanjima, Tokushima, 770-8506, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kohda
authors.affiliation: Department of Applied Chemistry, Tokushima University, Minamijosanjima, Tokushima, 770-8506, Japan.|Institute of Liberal Arts and Sciences, Tokushima University, Minamijosanjima, Tokushima, 770-8506, Japan.
authors.forename: Keiji
authors.initials: K
authors.lastname: Minagawa
authors.affiliation: Department of Applied Chemistry, Tokushima University, Minamijosanjima, Tokushima, 770-8506, Japan. imada@tokushima-u.ac.jp.
authors.forename: Yasushi
authors.identifier: http://orcid.org/0000-0002-4844-5418
authors.initials: Y
authors.lastname: Imada
mesh_terms: D002384:Catalysis; D002411:Cation Exchange Resins
chemical_list: D002411:Cation Exchange Resins
keywords: environmentally benign; flavinium salt; ion-exchange resin; organocatalysis; oxidation