Preparation of Pillar[n]arenes by Cyclooligomerization of 2,5‐Dialkoxybenzyl Alcohols or 2,5‐Dialkoxybenzyl Bromides
The facile and efficient preparation of pillar[n]arenes (n = 5 or 6) was achieved by cyclooligomerization of 2,5-dialkoxybenzyl alcohols or 2,5-dialkoxybenzyl bromides with an appropriate Lewis acid catalyst at room temperature. The mechanism for this cyclooligomerization is presumed to be a Friedel–Crafts alkylation.