in neat (no solvent) heating in Ar at 150 °C; detected by powder X-ray diffractometry;

in neat (no solvent) heating in Ar at 150 °C; detected by powder X-ray diffractometry;

in neat (no solvent) in air, heating at 138 °C, Cu2I2(2-chloropyrazine) then CuI and 2-chloropyrazine were formed, CuO was formed in the last step around 340 °C; detected by X-ray powder diffractometry;