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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