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Pure Appl. Chem. 75(2-3), 265-272, 2003

Pure and Applied Chemistry

Vol. 75, Issue 2-3

Microencapsulated methylrhenium trioxide (MTO)/H2O2 systems for the oxidation of cardanol derivatives

R. Saladino, E. Mincione, O. A. Attanasi, and P. Filippone

1Dipartimento di Agrobiologia ed Agrochimica, Unità INFM, Università della Tuscia, Via S. Camillo de Lellis, 01100 Viterbo, Italy; 2Unità INFM, Università della Tuscia, Via S. Camillo de Lellis, 01100 Viterbo, Italy; 3Centro di Studio delle Sostanze Naturali, Università di Urbino, 61029 Urbino, Italy

Abstract: A convenient and efficient application of microencapsulated/methylrhenium trioxide (MTO) and MTO/pyridine systems for the selective oxidation of cardanol derivatives is reported. Environmentally friendly and low-cost H2O2 was used as the oxygen atom donor. The catalysts were stable systems for at least five recycling experiments. In the oxidation of C2 alkyl-substituted cardanol derivatives, high conversion and yields of the corresponding para-benzoquinones were obtained. By contrast, in the absence of the C2 substituent, an unprecedented oxidative degradation to di-g-lactone derivative was observed.

*Pure Appl.Chem. 75, 141419 (2003). An issue of reviews and research papers based on lectures presented at the 23rd IUPAC International Symposium on the Chemistry of Natural Products, Florence, Italy, 28 July 2 August 2002.

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