ozone; triphenylphosphine in dichloromethane T=-78 - 20°C;

<b>Multi-step reaction with 2 steps<br /> </b>1: CoBr₂(1,2-bis(diphenylphosphino)ethane); zinc(II) iodide; zinc / dichloromethane / 20 &deg;C / Inert atmosphere<br />2: hydrogenchloride; water / diethyl ether<br /> <br /> &nbsp;