Selective Preparation of Cis 3,5-Dibromo-4-oxo-2,2,6,6-tetramethylpiperidin-1-hydroxy and Conversion to Nitroxide by Peroxide Copper Catalysed

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• 1H‐NMR spectra were recorded at 250 MHz on BRUKER AM 250 Chemical shifts are reported in part per million (ppm, δ values) relative to TMS as internal standard. ESR spectra were taken on a BRUKER ER 200E. Chemical Ionisation (CD were obtained on NERMAG R10–10 spectrometer, electronic energy 100 eV, ionisant gaz: Ammoniac, source temp 120°C at 10‐−1 orr. Mp were taken on Reichert melting point apparatus
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