Corrin Syntheses. Part V1: Preparation of Metal‐Free Corrin Derivatives via A→B Ring Closure. Complexation of the Corrin Chromophore with Metal Ions, and Some Properties of the Ligands in Corrin Complexes. Issue 11 (December 2015) - Blaser, Hans‐Ulrich; Winnacker, Ernst‐Ludwig; Fischli, Albert; Hardegger, Bruno; Bormann, Dieter; Hashimoto, Naoto; Schossig, Jürgen; Keese, Reinhart; Eschenmoser, Albert