M M iv v N N N N N ... A new synthesis of benzoporphyrins using 4,7-dihydro-4,7-ethano-2H- isoindole as a synthon of isoindole ... Satoshi Ito,a Takashi Murashima,a Hidemitsu Unob and Noboru Ono*a† a Department of Chemistry, Faculty of Science, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan b Advanced Instrumentation Center for Chemical Analysis, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan