Synthese und Eigenschaften von 1,3-Diisopropyl-4,5-dimethylimidazolium- 2-carboxylat. Ein stabiles Carben-Addukt des Kohlendioxids [1] / Synthesis and Properties of 1,3-Diisopropyl-4,5-dimethylimidazolium -2-carboxylate. A Stable Carbene Adduct of Carbon Dioxide [1]

Abstract

The reaction of 2,3-dihydro-l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (5) with CO 2 gives the imidazolium-2-carboxylate 6. The compound can be transformed into the salts of its corresponding Broenstedt acid 8 . The cationic acid chloride 10a is obtained from 6 and thionylchloride. Chemical properties and spectroscopic data indicate 6 to be less basic than its anionic counterparts, e. g. PhCO 2 - . The X-ray structure of 6 is reported.