1.1: dicobalt octacarbonyl / hexane / 1 h / |Inert atmosphere 1.2: 20 °C / 4500.45 Torr / |Inert atmosphere; |Molecular sieve 2.1: pyridine hydrogenfluoride / tetrahydrofuran / 0 - 20 °C / |Inert atmosphere 3.1: oxalyl dichloride; dimethyl sulfoxide / dichloromethane / -78 °C / |Inert atmosphere 3.2: -78 °C / |Inert atmosphere View Scheme