Advance 3 600

The 300 MHz ¹H and the 75 MHz ¹³C-{¹H} NMR spectra were measured on a Bruker AVIII 300 and the 600 MHz ¹H NMR spectra were performed using a Bruker Advance III 600. The 500 MHz ¹H NMR spectra were obtained using a Bruker AV DRX 500. MALDI–TOF spectra were performed on a Bruker Ultraflex TOF mass spectrometer, the molecular masses being recorded in linear mode. Dithranol was used as a matrix and sodium trifluoroacetate (NaTFA) as ionization reagent. The samples were dissolved in DMF. DSC measurements were performed using a Mettler Toledo DSC 822. The GC–MS analyses were carried out on Thermo Finnigan Trace DSQ GC/MS-System with THF as solvent. HPLC analyses were performed on BioTek Konton 525 equipped with UV detector (at 260 nm, diode array detector HPLC 540) at room temperature (column: Chiralcel OD-H, eluent: methanol/water 8:2, flow rate: 0,4 mL/min). Optical rotations were measured with a Perkin-Elmer 341 polarimeter in THF as solvent, with a concentration of 10 mg ml⁻¹. GPC analysis were carried out at 60 °C with N,N-dimethylformamide as eluent with a flow rate of 1 mL/min using a ViscotekGPCmax VE2001 system and a Viscotek VE 3500 RI detector. The system was calibrated with polystyrene standards with a molecular range from 1,280 g/mol to 1,373,000 g/mol.