Ttsbi

5,5′,6,6′,-Tetrahydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobisindane (TTSBI, 98%) was purchased from ABCR GmbH. 2,3,5,6-tetrafluoro-terephthalonitrile (TFTPN, 99%) was purchased from Lanxess. TFTPN was sublimated twice at 70 °C under vacuum prior to use. Potassium carbonate (K₂CO₃, 99%) was purchased from Alfa Aesar. The rest of the commercially available compounds as chloroform (CHCl₃), dichlorobenzene (DCB), dimethylacetamide (DMAc), ethanol (EtOH), NMP, THF were obtained from Merck Millipore and were used without further treatment.

The monomer 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobisindane (TTSBI, 97%) was obtained from ABCR (Karlsruhe, Germany) and 2,3,5,6-tetrafluoroterephtalonitrile (TFTDN) was kindly donated by Lanxess (Köln, Germany). TFTDN was sublimated twice at 80 °C and < 1 mbar prior to use. Potassium carbonate (K₂CO₃, >99,5%) was dried overnight at 120 °C under vacuum and then milled in a ball mill for 15 min.
For the synthesis of dimethyl-TTSBI (DMTTSBI) 3-methylcatechol, hydro bromic acid (HBr, 47% in H₂O) and acetic acid (HAc) were obtained from Sigma Aldrich. As well as benzoylperoxide (BPO, 75%), diethylbenzene (DEB), chlorobenzene (anhydrous) and sodium azide (99%) for further reactions. They were used as received. N-bromosuccinimide (NBS, ≥99%), N,N-dimethylacetamide (DMAc, ≥99.8%), N,N-dimethylformamide (DMF, ≥ 99.8%), chloroform (CHCl₃, 99.9%), methanol (CH₃OH, ≥99%) and acetone (≥99%) were obtained from Merck and used as received.

5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobisindane (TTSBI, 98%) was purchased from ABCR GmbH (Karlsruhe, Germany). 2,3,5,6-tetrafluoro-terephthalonitrile (TFTPN, 99%) was obtained from Lanxess (Cologne, Germany). TFTPN was sublimated twice at 70 °C under vacuum before use. Cyclohexyl maleimide (98%) was purchased from TCI (Portland, OR, USA). t-Butyl maleimide was purchased from Specific Polymers (Castries, France). Boron tribromide (BBr₃, 99%) was obtained from Acros Organics (Geel, Belgium). Potassium carbonate (K₂CO₃, 99%), methyl maleimide (98%), dimethyl acetamide (DMAc, 99%) and dichloromethane (DCM, 99%) were purchased from Alfa Aesar (Kandel, Germany). All other commercially available reagents were obtained from Merck (Darmstadt, Germany) and were used without further treatment.