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5846909 
Journal Article 
Selective hydrogenation of 1,3-diolefins catalyzed by cobalt(I)-bipyridyl complexes 
Kanai, H; Yamamoto, N; Kishi, K; Mizuno, K; Tarama, K 
1982 
Yes 
Journal of Catalysis
ISSN: 0021-9517
EISSN: 1090-2694 
73 
2 
228-236 
Selective hydrogenation of nonbranched 1,3-diolefins mainly to cis-2-olefins was carried out in THF-ethanol by the catalysis of CoX(bpy)2 (X = halogen, bpy = 2,2′-bipyridyl) prepared in situ from cobalt halides, 2,2′-bipyridyl, and zinc. The induction period, the rate, and stereoselectivity depend on the time when 1,3-butadiene and hydrogen are introduced to the catalyst. The rate is proportional to the hydrogen pressure and to the catalyst concentration, and changes with the concentration of 1,3-butadiene. An excess of butadiene inhibits hydrogenation and leads to dimerization. A mechanism is proposed which involves an anti-1-methyl-π-allylcobalt complex as an intermediate.