摘要/Abstract
报道了一种交联壳聚糖微球负载铜在水相中催化Ullmann反应的催化体系，对催化剂进行了一系列表征，并考察了催化剂的底物适用性.该催化剂只需要进行简单过滤即可回收，重复使用十次后仍能保持良好的催化活性.
关键词: 交联壳聚糖微球, Ullmann反应, 铜, 非均相催化, 水相
A green, efficient, and recyclable catalytic protocol for Ullmann C-N reaction in water was developed. The catalyst Chi-Gly@CuI was prepared by the cross-linking reaction of chitosan bead with glyoxal and subsequently anchored with copper salt. Chi-Gly@CuI bead of 0.3 mm in mean diameter possesses porous micro-structure demonstrated by scanning electron microscope (SEM). The structure of Chi-Gly@CuI was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectrometry (ICP-AES), and X-ray photoelectron spectroscopy (XPS). This catalytic protocol for Ullmann reaction in water exhibited high applicability, from which the corresponding coupling products were afforded in good to excellent yields. Chi-Gly@CuI could be easily separated from products by simple filtration almost without weight loss. Most notably, after 10 times of recycling, its catalytic activity and chemical stability were still maintained.
Key words: cross-linked chitosan bead, Ullmann reaction, copper, heterogenous catalysis, in water
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