1.1: pyridine hydrogenfluoride / tetrahydrofuran / 0 - 20 °C / |Inert atmosphere 2.1: oxalyl dichloride; dimethyl sulfoxide / dichloromethane / -78 °C / |Inert atmosphere 2.2: -78 °C / |Inert atmosphere View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 5 h / 20 &deg;C / |Inert atmosphere<br />2.1: dicobalt octacarbonyl / hexane / 1 h / |Inert atmosphere<br />2.2: 20 &deg;C / 4500.45 Torr / |Inert atmosphere; |Molecular sieve<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 5 h / 20 &deg;C / |Inert atmosphere<br />2.1: dicobalt octacarbonyl / hexane / 1 h / |Inert atmosphere<br />2.2: 20 &deg;C / 4500.45 Torr / |Inert atmosphere; |Molecular sieve<br /> <br /> &nbsp;