The monomers 2-n-butyl-2-oxazoline (BuOx), 2-n-butyl-2-oxazine (BuOzi), 2-n-pentyl-2oxazoline (PentOx) and 2-n-pentyl-2-oxazine (PentOzi) were synthesized following the procedure by Witte and Seeliger. Briefly, for BuOx and BuOzi, in a nitrogen flushed flask valeronitrile (for PentOx and PentOzi hexanenitrile), 3-amino-propanol (for the 2-oxazine synthesis or 2-amino-ethanol for the 2-oxazoline synthesis) and catalytic amounts of zinc acetate dihydrate were mixed and heated to 130 °C and the progress was controlled by H NMR spectroscopy. After completion of the reaction, the mixture was dissolved in dichloromethane and washed with H2O three times. The organic layer was dried with Na2SO4 and concentrated. The raw product was dried with CaH2 and distilled under reduced pressure under nitrogen atmosphere to yield the product as a colourless liquid. Detailed amounts can be found in the Supporting Information (Supporting Information Table -S4, Figure -S4).