Doubling Proton Magnetic Resonance Signals by Use of Tris(dipivalomethanato)europium(III)

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Abstract
Doubling of some p.m.r. signals from some steroidal diastereoisomers following treatment with the shift reagent, (DPM)3Eu(III), is reported for the first time. Similar examination of the hemithioethyleneketal of methyl isopropyl ketone provided the first evidence for the diastereotopic nature of the methyl groups of the isopropyl moiety of this compound. The resolution of signals from diastereoisomers and the failure to detect the diastereotopic nature of the methylene protons of different hemithioethyleneketals is discussed briefly in terms of inhibition of free rotation in pseudocontact association.

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