Photodimers of isobenzofuran: a novel application of lanthanide induced shift spectroscopy to determine stereochemistry
Abstract
In aceptone solution u.v. irradiation of isobenzofuran at –60 °C forms an [8 + 8] dimer shown by lanthanide induced shift spectroscopy to have the anti-stereochemistry; in ether solution an [8 + 8] dimer is obtained together with a skeletally modified dimmer, the structure of which is confirmed by synthesis.