From the list of 107 monomers, 14 were polymerized using a variation of Grubbs 3rd generation catalyst to see if any correlation between RSE and reactivity could be made (Figure C&D). The polymerizations were all performed with a 200:1 ratio of monomer:catalyst. The polymerizations were all carried out at ~0.5 M in dry, degassed CH2Cl2 at 35 °C under a nitrogen atmosphere. 7 of the monomers were selected based on their potential for gas transport membranes The cyclo-reversion could be interfering in the polymerization process as the 2,5-dimethylfuran maleimide Diels-Alder reaction is highly reversible at room temperature and has a low activation barrier (36 kcal/mol for a derivative) .