The poly(S-r-limonene) material (13.89 g) was dissolved in 300 mL of dichloromethane and the solution was poured onto 138.9 g silica gel in a 1000 mL round bottom flask. The solvent was then removed by rotary evaporation (40 ºC, 800 mbar). In cases where the silica gel adhered together, additional dichloromethane was added and the dry loading repeated to ensure even coverage on the silica. Finally, the silica was dried under high vacuum to remove any remaining solvent. The coated silica was isolated as an orange, free-flowing powder (150 g).