Direct P-Functionalization of Azobenzene by a Cationic Phosphidozirconocene Compound† Adrien T. Normand*, [a],[b] Constantin G. Daniliuc,‡ [a] Gerald Kehr, [a] Pierre Le Gendre [b] and Gerhard Erker [a] [a] Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany. [b] Institut de Chimie Moléculaire de l’Université de Bourgogne, ICMUB UMR6302, CNRS, Univ. Bourgogne Franche-Comté, F-21000 Dijon, France. Supporting Information Electronic Supplementary Material (ESI) for Dalton Transactions. This journal is © The Royal Society of Chemistry 2016