Applications of Chitosan and Its Derivatives Supported Transitional Metal Catalysts in Organic Reactions

Abstract

Due to its good coordination ability to the metal compounds, chitosan and its derivatives can be used as a kind of good catalysts carrier. Recently, the catalytic properties of chitosan and its derivatives supported metal catalyst have been attracted more attentions. Based on the kind of reactions, the applications of chitosan and its derivatives supported metal catalysts in the catalytic asymmetric reaction, allylic substitution, coupling, addition, oxidation, reduction and some other reactions are reviewed. Keywords chitosans; chitosan derivatives; transition metal; catalytic reaction; asymmetric reaction 如制备壳聚糖衍生物及络合金属离子). 近年来壳聚糖 作为生物高分子广泛应用于 Pt、Ru、Rh 或 Pd 等贵金属 催化剂的载体 [20] , 其负载金属催化剂已经广泛应用在 氧化、还原、加成等反应中, 表现出优良的催化性 能 [21～23] . Guibal [24] 和 Macquarrie 等 [25] 对早期壳聚糖及其 衍生物负载的金属催化剂的形态结构、催化反应的研究 已经进行了详细地综述. 目前壳聚糖及其衍生物在催化 反应中主要用作催化剂的载体, 但其分子中的氨基可作 为有机碱, 在新近的报道中其本身也可以作为催化剂催 化反应 [26,27] . 本文以反应类型为主线, 对近年来壳聚糖 及其衍生物负载金属催化剂催化有机反应进行了综述.

Insightful understanding of the correlations of the microstructure and catalytic performances of Pd@chitosan membrane catalysts studied by positron annihilation spectroscopy

“…However, the inorganic carries oen need modication to further improve their chelating ability with transition metal catalysts. Recently, more and more attentions has been paid to bio-polymeric supports, which have strong chelating ability with transition metals for the containing of numerous polar groups on the macromolecule backbone, especially carbohydrate polymers, such as starch, 22,23 cellulose, [24][25][26] alginate, 27,28 and chitosan, [29][30][31][32][33] etc. Among them, chitosan (CS), deacetylated products of chitin, is considered to be one of the most promising transition metal catalysts supports for its high chelating ability with the transition metals (containing plenty of amino-groups and hydroxyl groups on the macromolecule backbone) and easy-tailoring of processing into different forms including membranes, microspheres, and nanobers, etc.…”

Research Progress of Chitosan Supported Copper Catalyst in Organic Reactions

“…壳 聚糖分子结构中含有大量的羟基和氨基(图 1), 能够通 过多种化学反应修饰制备不同类型的壳聚糖衍生物, 如 羧甲基化 [9] 、磺化 [10] 、卤化 [11] 和酰胺化反应 [12][13][14] 等, 尤 其是可与醛反应生成席夫碱, 增强其配位能力. 壳聚糖 及其衍生物能够有效络合各种类型的金属粒子(Au、 Ag、 Ru、Pd 等) [15][16][17][18][19][20][21][22][23][24] , 并作为催化剂应用于不同类型的有机 反应中 [25] . 与单一壳聚糖相比, 修饰后的壳聚糖衍生物 作为载体时, 所得催化剂可能表现出不同的催化活性或 选择性, 从而进一步扩大了壳聚糖载体的应用范围.…”