The functionalisation of various heterocyclicbases induced by sunlight is reported. The photoreaction occurred with higher yield in a liquid-solid heterogeneous system in the presence of polycrystalline TiO2 (anatase) than in a homogeneous system under the same experimental conditions.
Polar effects in free-radical reactions. Carbamoylation and .alpha.-N-amidoalkylation of heteroaromatic bases by amides and hydroxylamine-O-sulfonic acid