Dibutyltin dilaurate

L,L-Lactide from Purac was recrystallized from 2-propanol, sublimated, and stored under vacuum. The 2-bromoethanol (95%), 4-hydroxybenzophenone (HBP, 98%), hexamethylene diisocyanate (HDI, 99%), ethylene glycol (EG, 99.8%), which were all from Sigma-Aldrich (St. Luis, MO, USA/Steinheim, Germany), were used as received. Acrylonitrile (AN, 99%) was passed through an inhibitor removal column filled with silica gel and distilled under a vacuum. Styrene was purified with basic Al₂O₃ to remove the inhibitor and distilled under a vacuum. Trifluoromethanesulfonic acid (triflic acid, 99%) from Sigma-Aldrich was distilled under vacuum, and dibutyltin dilaurate (DBTDL, 98%) from ABCR was used as received. Dichloroethane (DCE, pure p.a.), dimethylformamide (DMF, pure p.a.), and anisole (pure p.a.) from POCH (Gliwice, Poland) were dried over CaH₂, distilled before use, and stored over molecular sieves (4 Å). Chloroform (pure p.a.), 2-propanol (pure p.a.), ethanol (pure p.a.), diethyl ether (pure p.a.), and hexane (99%), all from POCH (Gliwice, Poland), were used as received. Potassium hydroxide (pure p.a.) was obtained from POCH (Gliwice, Poland), magnesium sulfate (MgSO₄, 99%) was obtained from Chempur (Piekary Slaskie, Poland), and both were used as received.

Chloroacetic acid (ClAAc, pure), alkenes: 1-decence (C10, >97%), 1-tetradecene (C14, >97%); chloroform (purum, >99.5%), chloroform-d (>99.8 atom %D, with 0.05% (v/v) tetramethylsilane), dimethyl sulfoxide (DMSO, >99.5%), 7-diethylamino-3-(4-maleimidophenyl)-4-methylcoumarin (CPM, >90%), and fluorescein diacetate 5-maleimide (FDM, for fluorescence) were acquired from Sigma-Aldrich (St. Louis, MO, USA); 3-mercaptopropyltrimethoxysilane (McPTMS, >95%) and dibutyltin dilaurate (DBTL) were acquired from ABCR (Karlsruhe, Germany); 1-propanol (PrOH, Baker analysed >99%) was acquired from Fischer Scientific (Hampton, NH, USA). White, commercially available plain-weave cotton fabrics were used without any further treatment; 70 mm diameter Whatman Schleicher & Schuell ashless 589/2 white ribbon filter paper (Maidstone, UK) was used as the paper substrate without any further treatment.