Photochemical Schiemann Reaction in Ionic Liquids

摘要

Photochemical Schiemann reactions of imidazole derivatives >1 and >4 were carried out in 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid [bmim][BF4] as solvent. The effects of temperature, co-solvent and wavelength on the rate of the reaction and product yield were examined. The use of ionic liquid increases the yield of the photochemical fluorodediazoniation reaction of >2 at 0°C. Careful temperature control is necessary to minimize the photodecomposition of the ionic liquid in order to increase the yield of product.