Novel [4-Hydroxy-TEMPO + NaCl]/SiO2 as a Reusable Catalyst for Aerobic Oxidation of Alcohols to Carbonyls
Naoya Tamura, Tadashi Aoyama*, Toshio Takido, Mitsuo Kodomari
*Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, Kanda Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan, Email: aoyama.tadashinihon-u.ac.jp
N. Tamura, T. Aoyama, T. Takido, M. Kodomari, Synlett, 2012, 23, 1397-1407.
DOI: 10.1055/s-0031-1290980 (free Supporting Information)
A convenient method enables the preparation of a silica gel supported TEMPO catalyst. The catalyst prepared from [4-hydroxy-TEMPO + NaCl]/SiO2 was used for an aerobic oxidation of alcohols to carbonyls under mild reaction conditions in the presence of Fe(NO3)3 • 9 H2O. Alcohols were converted to the corresponding carbonyls in good to excellent yields. After a simple filtration, the catalyst can be reused at least six times.
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