Sodium metabisulphite

Diallyldimethylammonium chloride (65 wt % in H₂O) and triallylamine (99%) were purchased from Sigma Aldrich, and piperazine and D₂O (99.9%) were obtained from Merck KGaA (Darmstadt, Germany). Allyl bromide (99%), potassium carbonate (99%), methanol (99%), and 1,3-bis(4-piperidyl)propane (97+%) were purchased from Alfa Aesar (Kandel, Germany). The anion exchange-resin Lewatit Monoplus MP 800 was provided by Lanxess (Leverkusen, Germany). Chloroform (≥99%), acetone (≥99%), bidistilled water, potassium hydroxide, dichloromethane (≥99%), potassium persulfate, sodium metabisulphite, N,N′-methylenebisacrylamide and sodium hydroxide (97%) were obtained from VWR International GmbH (Darmstadt, Germany). All chemicals were used as received. Polyester filter bags with a maximum mesh size of 90 µm were purchased from Rosin Tech Products (Bethpage, NY, USA).

The anion exchange-resin Lewatit Monoplus MP 800 was provided by Lanxess (Leverkusen, Germany). Double-distilled water, potassium hydroxide, chloroform (≥99%), acetone (≥99%), dichloromethane (≥99%), potassium persulfate, sodium metabisulphite, sodium hydroxide (97%) and N,N’-methylenebisacrylamide were obtained from VWR International GmbH (Darmstadt, Germany). Potassium carbonate (99%), allyl bromide (99%), methanol (99%) and 1,3-bis(4-piperidyl)propane (97+%) were obtained from Alfa Aesar (Kandel, Germany), diallyldimethylammonium chloride (65 wt% in H₂O) and triallylamine (99%) were obtained from Sigma Aldrich. Piperazine, diallylamine (97%) and D₂O (99.9%) were purchased from Merck KGaA (Darmstadt, Germany). The polyester filter bags with a maximum mesh size of 90 µm were bought from Rosin Tech Products (Bethpage, NY, USA).