T=180°C; P=0.5 Torr;

pyridine; xanthone powder; bis(2,4-acetylacetonate)cobalt(II); hydrogen in tetrahydrofuran T=17°C; P=760 Torr; Irradiation;

pyridine; xanthone powder; bis(2,4-acetylacetonate)cobalt(II); hydrogen in tetrahydrofuran P=760 Torr; Ambient temperatureIrradiation; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

sulfuric acid