Catalytic Hydrogenation of Cyclopentadiene with Bis(dimethylglyoximato)- dipyridinecobalt(II) by Liquid Phase Flow Fashion

Abstract

Selective catalytic hydrogenation of cyclopentadiene (CPD) to cyclopentene (CPE) with bis(dimethylglyoximato) dipyridinecobalt (II) (Co (Hdmg), py, , dipyridinecobaloxime), which showed more stable catalytic activity than Co (Hdmg), py, as reported previously, was carried out in the Dimethyl Carbitol solution (3.3 x 10-2 mol/l) by continuous feeding of CPD (6.7 x 10-5---'4.2 X 10-4 mol/min) at 40-60°C under bubbling flow (60--300 m//min) of hydrogen. A 45.3 mol/ mol of CPE (per mol of catalyzer) was obtained in the maximum yield, when the hydrogen flow rate and the reaction temperature were 220 ml/min and 40°C, respectively.