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Conventional supported heterogeneous palladium catalysts in combination with a dicyanamide based ionic liquid are highly active with excellent selectivity in enabling the one-pot synthesis of citronellal through citral hydrogenation.

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Terpenes U 0200The Promoting Effect of a Dicyanamide Based Ionic Liquid in the Selective Hydrogenation of Citral. -A dicyanamide-based ionic liquid improves the hydrogenation of citral (I) to citronellal (II) in a way which has not been observed with other ones yet. The consecutive hydrogenation of (II) to dihydrocitronellal is strongly inhibited by the ionic liquid leading to a selectivity of >99% at full conversion. The best results are achieved using a Pd catalyst coated with ionic liquid. -(ARRAS, J.; STEFFAN, M.; SHAYEGHI, Y.; CLAUS*, P.; Chem. Commun. (Cambridge) 2008, 34, 4058-4060; Ernst-Berl Inst., Tech. Univ. Darmstadt, D-64287 Darmstadt, Germany; Eng.) -M. Paetzel 04-175