Several spin-labeled oxyphosphoranes have been prepared by oxydative addition of biacetyl and hexafluoroacetone to phosphites containing the 4-oxy-1-oxyl-2,2,6,6-tetra-methylpiperidine group. The new compounds have been characterised by ESR and 31P NMR spectroscopy as well as by mass spectra.
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Storzer et al. (1978) studied this question.