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General. THF was distilled from Na / benzophenone before use. Triethylamine was distilled from CaH 2 . All other solvents used were reagent grade. All reagents were used as supplied. All 1 H NMR spectra were measured with a Bruker DRX-500 spectrometer at 500 MHz. Analytical size exclusion chromatography (SEC) in N,N-dimethylformamide (DMF) HPLC grade with 0.2% wt LiBr was performed at 70 °C at a nominal flow rate of 1.0 mL/min on a chromatography line calibrated with lineardoi:10.1039/b509398h pmid:16228024 fatcat:5ai4rs3pzrdu7jolzoxrw2z65a