1. Photochemistry Center of the Russian Academy of Sciences, 7a ul. Novatorov, Moscow 119421, Russia, Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia, and N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., Moscow 117913, Russia, Wright-Rieman Labs, Rutgers University, Piscataway, New Jersey 08855-0939, Department of Organic Chemistry, Umeå University, Umeå SE-901 87, Sweden, and Department of...