Diallyldimethylammonium and trimethylvinylammonium ionic liquids—Synthesis and application to catalysis

Authors:  Hieronim Maciejewski, Karol Szubert, Ryszard Fiedorow, Rafał Giszter, Michał Niemczak, Juliusz Pernak, Witold Klimas

Abstract:
New quaternary ammonium salts containing unsaturated substituents (allyl or vinyl) were synthesized. All of them were subjected to spectroscopic, elemental and thermogravimetric analyses. The above compounds are ionic liquids (T_m < 100 ^◦C) and were applied to immobilization of three rhodium(I) complexes [Rh(PPh₃)₃Cl], [{Rh(-Cl)(cod)}₂] and [{Rh(-OSiMe₃)(cod)}₂] as well as three platinum complexes at different oxidation states [Pt(PPh₃)₄], K₂[P_tC_l4] and K₂[P_tC_l6]. Homogeneous catalytic systems were obtained and employed in the biphasic process of hydrosilylation of octene and allyl glycidyl ether with 1,1,1,3,5,5,5-heptamethyltrisiloxane. Catalytic activities of all the systems were compared and the best one was selected. The latter made it possible to recycle 10 times the same catalyst sample without a decrease in its activity and to easy separate the catalyst from the post-reaction mixture by decantation. The developed system is one of the most effective catalytic systems for hydrosilylation known to date. 

Keywords:
Ionic liquids
Quaternary ammonium salts
Immobilization
Rhodium and platinum complexes
Biphasic hydrosilylation

Published in: Applied catalysis A: General  (Volume 451, Pages 1-288, 31 January 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Diallyldimethylammonium and trimethylvinylammonium ionic liquids—Synthesis and application to catalysis

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