10.1021/acs.joc.6b00647.s003 Michael J. Rodig Michael J. Rodig Arthur W. Snow Arthur W. Snow Paul Scholl Paul Scholl Simon Rea Simon Rea Synthesis and Low Temperature Spectroscopic Observation of 1,3,5-Trioxane-2,4,6-Trione: The Cyclic Trimer of Carbon Dioxide American Chemical Society 2016 FTIR Trioxane Low Temperature Spectroscopic Observation 13 C NMR CO 2 CO 2 trimer 2016-05-16 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Synthesis_and_Low_Temperature_Spectroscopic_Observation_of_1_3_5-Trioxane-2_4_6-Trione_The_Cyclic_Trimer_of_Carbon_Dioxide/3412891 1,3,5-Trioxane-2,4,6-trione (cyclic trimer of CO<sub>2</sub>) is the product of a four-step synthesis: chlorination of isobutyraldehyde; cyclotrimerization of 2-chloro-2-methylpropanal; dehydochlorination of 2,4,6-tris­(2-chloropropan)-2-yl-1,3,5-trioxane; ozonolysis at −80 °C of 2,4,6-tri­(propan-2-ylidene)-1,3,5-trioxane. This trioxane-trione is detected in solution at temperatures between −80 to −40 °C, and its conversion to CO<sub>2</sub> is monitored by <sup>13</sup>C NMR and FTIR. The CO<sub>2</sub> trimer has a half-life of approximately 40 min at −40 °C.