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Competitive hydrogenation of mixtures of related unsaturated compounds remains a challenging problem. Recently, solid catalysts with an ionic liquid layer (SCILL) have shown potential for increased catalyst selectivity under batch conditions. Our results for the continuous flow competitive hydrogenation of 1‐octyne and 1,7‐octadiene versus 1‐octene with a nickel SCILL catalyst indicate improved catalyst selectivity under trickle bed conditions. Different ionic liquids ([MMIM][MeOSO3], [MMIM][OcOSO3], [MMIM][NTf2], [MePsec‐Bu3 ][MeOSO3], and [Et3S][NTf2]; MMIM=1,3‐dimethylimidazole and Tf=trifluoromethanesulfonyl) with varying catalyst loadings were investigated. The results highlight the importance of potential site‐specific interactions by the ionic liquid. They also indicate the importance of the cation for these effects.

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Lewis does it better: Aluminum triflate readily replaces Brønsted acid cocatalysts in the palladium‐catalyzed methoxycarbonylation reaction of styrene and 1‐pentene, producing catalysts that are stable and more active than those using traditional acids. Catalyst loadings of 0.02 % allow conversions of up to 100 % to be achieved within three hours with no loss of linear/branched ester selectivity.

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