Abstract
The kinetics of the catalytic hydrogenation of isoquinoline to decahydroisoquinolines over Raney nickel under hydrogen pressures of 10–100 kg/cm 2 at 190–220°C was studied. The results clearly show that the major reaction proceeded consecutively through the following steps: isoquinoline → 1,2,3,4-tetrahydroisoquinoline →5,6,7,8-tetrahydroisoquinoline → cis-decahydroisoquinoline → trans-decahydroisoquinoline, although some simultaneous reactions also contributed under high hydrogen pressure (≥50 kg/cm 2). The reaction mechanism is discussed on the basis of the adsorption forms of the substrates and the thermal stabilities of the products calculated by molecular orbital methods.
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