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. ... Dedicated to Ulrich Scho¨llkopf on the occasion of his 60th birthday. ... The total rates of deprotonation plus nucleophilic substitution at C-2 of the title compounds by butyllithium are approximately 25–4000 times higher than that of 3, 3-diethyloxetane.