Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Ketalization reaction of racemic 1,3-alkanediols with ℓ-menthone gave a mixture of diastereomeric spiroketals that was easily separated by silica gel column chromatography and converted into enantiomerically pure diols by acid-catalyzed hydrolysis. ... Reaction of racemic 1,3- ...