1. Department of Chemistry, Kyungpook National University, Taegu 702-701, Korea, Department of Industrial Chemistry, Kyungpook National University, Taegu, 702-701, Korea, and Department of Chemical Technology, Kurashiki University of Science and the Arts, 2640 Nishinoura, Tsurajima-cho, Kurashiki, Okayama 712-8505, Japan