木质素-四乙烯五胺负载钯配合物的制备及对Suzuki反应的催化性能

Synthesis of Lignin-tetraethylenepentamine Palladium Complex and Its Catalytic Properties for Suzuki Reaction

采用较温和的Mannich反应制得了木质素-四乙烯五胺,并以其为载体通过简单的方法制备了木质素-四乙烯五胺负载钯催化剂。利用TG、DTA和XPS等测试技术对其结构进行了表征。该催化剂对碘苯与四苯硼钠的Suzuki反应有较好的催化活性,在80℃下空气氛围中反应8h,以V(DMF)∶V(H2O)=2∶1混合液为溶剂,NaHCO3为碱时,反应产率高达90.2%。催化剂可以通过简单的方法回收但重复使用性能有一定下降,重复使用4次后产率降至31.3%。

Lignin-tetraethylenepentamine was synthesized from Lignin and tetraethylenepentamine（ TEPA） with formaldehyde as a cross-linking agent by Mannich reaction. The prepared complex was used as a matrix to support palladium chloride. Lignin-TEPA-Pd complex was characterized by XPS,TG and DTA,which was an efficient catalyst for the Suzuki reaction of iodobenzene with sodium tetra-phenylboron. The yield of the product was up to 90. 2% when the reaction was carried out at 80 ℃ in air for 8 h with V（ DMF） ∶ V（ H2O） = 2∶1 mixture as the solvent and NaHCO3 as the base. The catalyst could be separated easily,but the yield of product decreased to 31. 3% after 4 times reusage.