Reaction of 2,3,4,5,6-pentafluorobenzyl bromide with N-hydroxyphthalimide produced N-(2,3,4,5,6-pentafluorobenzyloxy)phthalimide which, after hydrazinolysis and treatment with hydrogen chloride, yielded O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride. The latter compound was used to derivatize keto steroids for their analysis by electron-capture GLC.
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