ChemInform Abstract: The Dimethylamine ‐ Carbon Dioxide ‐ Complex Dimcarb and Its Preparative Use.

Abstract

The authors give a review about the unconventional properties of the complex consisting of dimethylamine (I) and carbon dioxide (II) in a ratio of 2:1.

Self-associated, “Distillable” Ionic Media

“…These then deaminate. It seems that, in the case of the aldol-condensation reactions, the DIMCARB is acting as both a dimethylamine donor and as a solvent/catalyst as previously observed [6,9].…”

“…Dialcarbs can be readily and inexpensively produced in bulk (litres can be prepared on the laboratory-scale within a few hours), merely by mixing the reactants in the appropriate ratio in the gas phase, with cooling [6].…”

“…Although dialcarbs, and particularly DIMCARB, have been investigated by Schroth et al [6] and more recently by Hess and coworkers [9], their potential applicability appears to have been overlooked by others. The major focus of the aforementioned researchers [6,9] was on the utility of DIMCARB as a convenient and safe precursor of dimethylamine, carbon dioxide and dimethylcarbamate in synthetic chemistry.…”

“…The major focus of the aforementioned researchers [6,9] was on the utility of DIMCARB as a convenient and safe precursor of dimethylamine, carbon dioxide and dimethylcarbamate in synthetic chemistry.…”

High solubility of Victorian brown coal in ‘distillable’ ionic liquid DIMCARB

“…http A series of 'distillable' ILs synthesised by mixing CO 2 with a secondary amine have similar properties to conventional ILs, but can be easily recovered by dissociation to the respective amine and CO 2 at relatively low temperature and then be re-associated by condensation [9,10]. They can be readily synthesised at low cost and in bulk at a laboratory scale [11]. As early as in the 1950s these ammonium carbamates were used as solvents in patented processes to dissolve oils or aromatic hydrocarbons [12][13][14].…”