在干燥空气中能逐渐氧化成氧化铜(能溶于盐酸)，溶于稀硫酸和稀硝酸生成相应铜盐，并有部分金属析出，不溶于水。有毒。防潮、密封保存。测定偶氮化合物中的氮时作还原剂，红色釉彩，电镀，杀菌剂，红色玻璃，船底油漆，植物种子杀菌，催化剂。 Copper(I)oxide is a weak base that can be used in nucleophilic substitution, decarboxylation, cyclocondensation, and 1,1-addition reactions. It can also be used to form carbenoid intermediates from diazo compounds and radicals from arenediazonium salts Application： Copper(I) oxide can be used as a catalyst to synthesize: Ynones via solvent-free Sonogashira reaction； N-Heteroaryl derivatives via cross-coupling of nitrogen heterocycles with halopyridines