in benzene T=70°C; 3 h;

in solid matrix Irradiation (UV/VIS); quartz UV cell, degassing by three freeze-pump-thaw cycles, placing th cell into a quartz windowed Dewar filled with liquid N2, irradn. with a low-pressure mercury lamp (254 nm) at 77K in 3-methylpentane matrix, warming to room temp., recooling to 77K; detd. by UV;

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