Copper ferrite nanoparticle modified starch as a highly recoverable catalyst for room temperature click chemistry: multicomponent synthesis of 1,2,3-triazoles in water†,New Journal of Chemistry

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Copper ferrite nanoparticle modified starch as a highly recoverable catalyst for room temperature click chemistry: multicomponent synthesis of 1,2,3-triazoles in water†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7nj03284f
Reza Bonyasi _{1,

2,

3,

4,

5} , Mohammad Gholinejad _{1,

5,

6,

7} , Fariba Saadati _{1,

2,

3,

4,

5} , Carmen Nájera _{8,

9,

10}

Affiliation

A new magnetic catalyst comprising starch-supported CuFe₂O₄ NPs as a highly water dispersible material is prepared and characterized by different techniques such as TEM, SEM, VSM, EDX-mapping, XPS, and TG analyses. The obtained CuFe₂O₄@Starch is applied as a heterogeneous catalyst in click chemistry for the three-component synthesis of 1,2,3-triazoles in water at room temperature with low copper loading (0.1 mol%). Using this catalyst, benzylic halides, alkyl bromides and arylboronic acids reacted with sodium azide and terminal alkynes giving 1,4-disubstituted 1,2,3-triazoles in high yields. The catalyst can be easily separated from the reaction mixture using an external magnet and reused for at least 11 consecutive runs with a slight drop in its catalytic activity. The reused catalyst was characterized by TEM, VSM and XPS analysis showing similar structure to the fresh catalyst with a slight decrease of the magnetization value and small aggregations of nanoparticles.

中文翻译：

铜铁氧体纳米粒子改性淀粉可作为室温点击化学的高度可回收催化剂：水中1,2,3-三唑的多组分合成†

制备了一种新型的磁性催化剂，其包含淀粉负载的CuFe ₂ O ₄ NPs作为高度水分散性材料，并通过不同的技术（例如TEM，SEM，VSM，EDX映射，XPS和TG分析）进行了表征。所得的CuFe ₂ O ₄淀粉在点击化学中用作非均相催化剂，用于在室温下以低铜负荷（0.1摩尔％）在水中进行1,2,3-三唑的三组分合成。使用这种催化剂，苄基卤化物，烷基溴化物和芳基硼酸与叠氮化钠和末端炔烃反应以高收率得到1,4-二取代的1,2,3-三唑。使用外部磁体可以很容易地将催化剂从反应混合物中分离出来，并至少连续11次重复使用，其催化活性略有下降。通过TEM，VSM和XPS分析对重复使用的催化剂进行了表征，显示出与新鲜催化剂相似的结构，磁化值略有下降，纳米颗粒的聚集较小。

更新日期：2018-01-15

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