Regiospecific topochemical reactions controlled by trifluoromethyl directing groups†
Abstract
A parallel, offset-stacked orientation was found in the crystal packing of E,E-1,4-di(o-trifluoromethyl)phenyl-1,3-butadiene. UV-irradiation of the powered crystalline sample resulted in a quantitative conversion to a single [2 + 2] cycloaddition product.