The mass spectra of methyl, n‐butyl, t‐butyl, phenyl and cyclohexyl boronates of various classes of steroid are reported and discussed. Steroid types represented are 17α, 21‐dihydroxy‐20‐ketones, 17α, 20, 21‐triols, 17α, 20‐diols, 20, 21‐ketols. Each gives rise to characteristic fragmentation modes, although derivatives of the 20α‐ and 20β‐hydroxy compounds have similar spectra.
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Brooks et al. (1971) studied this question.
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