Cyclohexadienes, 1,3-cyclohexadiene (1) and 1,4-cyclohexadiene (2), disproportionated to benzene (3) and cyclohexene (4) in the presence of catalytic amounts of metallic nickel prepared from nickel halides and zinc powder in N,N-dimethyformamide (DMF) under nitrogen.
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Sakai et al. (1985) studied this question.
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