Hydroaminomethylation of long chain olefins with secondary amines was performed efficiently in ionic liquids 1-n-alkyl-3-methylimidazolium tosylates [Rmim][p-CH3C6H4SO3] (R = n-butyl, octyl, dedecyl, cetyl) with Rh-BISBIS (sulfonated 2,2′-bis(diphenylphosphinomethyl)-1,1′ -biphenyl) complex as catalyst. High activity and selectivity for amines were achieved. The ionic liquid containing catalyst can be easily separated from product and re-used several times with only a slight decrease in activity.
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Wang et al. (2006) studied this question.
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