1. A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russian Federation, Fax: +7‐3952‐419346, http://www.irkinstchem.ru
2. N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, 9 Lavrentiev Ave., 630090 Novosibirsk, Russian Federation