[CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][N:2]=1>[Ru]>[CH2:1]1[CH:10]2[CH:5]([CH2:6][CH2:7][CH2:8][CH2:9]2)[CH2:4][CH2:3][NH:2]1In this invention, when synthetic isoquinoline or refined coal tar isoquinoline or partially hydrogenated isoquinoline is used as the raw material, it is hydrogenated in its unmodified form in the presence of a ruthenium catalyst to produce decahydroisoquinoline.
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