《Table 1 Reaction catalyzed by cross-linked chitosan beads supported copper complexa》

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《交联壳聚糖微球负载铜水相催化Ullmann反应（英文）》

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The Ullmann C—N reaction of iodobenzene with imidazole was used again as a model reaction to evaluate the reusability of [email protected] with fine power，the form of spherical beads could be easily separated from products by simple filtration without weight loss，and then the spherical catalyst was washed four times with water and ethyl acetate.The separated spherical catalyst was added into model reaction under the same reaction conditions.The results of reusable catalyst were shown in Figure7.It was exhibited that the catalyst maintained catalytic activity after being reused 10 times.In order to analyze copper leaching of reusable catalyst，the copper content in the original catalyst was measured to be 2.16 wt%by the ICP-AES.After several reactions，the copper content in the separated spherical catalyst was measured to be 1.98 wt%in the third run and 1.14 wt%in the fifth run.It was confirmed that Chi-Gly@CuI maintained excellent catalytic activity after several runs of this reaction.