1.1
Reagents:
Potassium carbonate
Solvents:
Xylene
;
2 h, reflux; reflux → 40 °C
1.2
Catalysts:
Copper
;
30 - 40 °C; 40 °C → 150 °C; 50 - 60 h, 140 - 150 °C; 150 °C → 65 °C