Csaba Fehér

Oligomerisation of isobutene with silica supported ionic liquid catalysts

Bronsted acidic ionic liquids, supported on silica gel, have been used effectively in oligomerisation of isobutene. The supported catalysts could be used several times without loss of activity or change in selectivity. The ratio of the products could be influenced by the proper choice of the ionic liquid component of the catalyst and the reaction temperature.

Synthesis of ferrocene-labelled 2-aminopyrimidine derivatives via homogeneous catalytic carbonylation

The palladium-catalyzed carbonylation of iodoferrocene was investigated in the presence of 2-aminopyrimidine derivatives as nucleophiles. 2-Amino-4-hydroxy-6-methylpyrimidine was found to act both as an O- and an N-nucleophile, leading to an ester and an amide derivative, respectively. Together with other spectroscopic methods, the structure of both products was proved by X-ray crystallography. 2-(Ferrocenoylamino)-4-chloro-6-alkylpyrimidines were obtained during carbonylation of iodoferrocene and 2-amino-4-chloro-6-alkylpyrimidines. The formation of a dimeric product via two subsequent carbonylation steps was also observed. The products may have practical importance as electrochemically detectable biosensors or building blocks for supramolecular assemblies.Graphical abstract

Oligomerization of Izobutene in the Presence of Ionic Liquid – Based Catalysts

In the petrochemical industry, the C4 stream including isobutene is an important raw material that can be upgraded. Oligomerization of isobutene is a very promising reaction, as the hydrogenation products of dimers and trimers, obtained from isobutene, can be used as gasoline and diesel additives, respectively. In the present paper, our results concerning the use of Bronsted acidic ionic liquids as oligomerization catalysts are presented. The ionic liquids were supported on silica. Most of the solid catalysts were reused several times without loss of activity. By the proper choice of the ionic liquid and reaction conditions, good selectivity towards either C8 or C12+ products could be achieved.

Catalytic Applications of Supported Ionic Liquid Phases

Supported ionic liquids (SILPs), prepared via the immobilization of ionic liquids on solid material, can efficiently be used in catalytic reactions as catalysts, or as supports for transition metal catalysts. The SILP concept combines the advantages of homogeneous catalysis with those of heterogeneous systems. In the present paper, this is demonstrated with two examples. In the first application, acidic SILPs are shown to be selective and recyclable catalyst for the trimerization of isobutene. In the second example, neutral SILPs are proved to be excellent supports stabilizing palladium catalysts for carbonylation reactions, as well as ensuring effective catalyst recycling.