Determination of 1,3-butadiene dicarbonate produced by supercritical reactions using electrospray ionization mass spectrometry

Abstract

The introduction reaction of carbon dioxide from 1,3-butadiene diepoxide to 1,3-butadiene dicarbonate was studied using catalysts of various alkali halides in supercritical carbon dioxide (scCO₂). The reaction products were analyzed by electrospray ionization mass spectrometry (ESI-MS); also, the catalytic effect of alkali halides was examined. The results indicated that sodium iodide had the greatest catalytic effect among them. A tendency of the effect was considered based on the difference in the ion radius between alkaline metal and halogen, or the difference in the electronegativity of halogens. ESI-MS was a useful technique to analyze carbonate compounds formed by the scCO₂ reaction.