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Most experimental data seems to use the racemic mixture. Is there literature on the enantiomers? There may be a paper in Chimiké Listy volume 51 (1957) by Lukes and Langthaler, whose title translates into "degradation of branched optically active tertiary bases", but I don't have access to it.
The racemic mixture seems to be very hard to crystallize (glass transition at 123 K). Perhaps the pure enantiomers can be crystallized?
-- Jorge Stolfi ( talk) 04:06, 6 November 2018 (UTC) reply