Spin-labelled esters of both cortisol and testosterone have been synthesized using the coupling reagent NN′-thionyldiimidazole (1); use of more conventional coupling or dehydrating reagents failed to give these spin labels, suggesting that (1) may be useful in the esterification of other hindered, relatively unreactive alcohols.
J. R. Dodd and A. J. Lewis, J. Chem. Soc., Chem. Commun., 1975, 520 DOI: 10.1039/C39750000520
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