Retraction: An Efficient Synthesis of Poly(ethylene glycol)-Supported Iron(II) Porphyrin using a Click Reaction and its Application for the Catalytic Olefination of Aldehydes
作者:Suman L. Jain、Jomy K. Joseph、Fritz E. Kühn、Oliver Reiser
DOI:10.1002/adsc.200800361
日期:2009.1
iron(II) porphyrin using a copper-catalyzed azide-alkyne [3+2] cycloaddition is reported. In contrast to the existing methods for the synthesis of PEG-immobilized metalloporphyrins, the click method offers better catalyst loading under comparatively mild reaction conditions. The prepared complex 5 (PEG-C51H39FeN7O) was found to be an efficient catalyst for the selective olefination of aldehydes with ethyl
据报道,使用铜催化的叠氮化物-炔烃[3 + 2]环加成法成功地成功合成了聚乙二醇(PEG)固定化的铁(II)卟啉。与合成PEG固定的金属卟啉的现有方法相反,点击法在相对温和的反应条件下提供了更好的催化剂负载量。发现所制备的配合物5(PEG-C 51 H 39 FeN 7 O)是在三苯基膦存在下用重氮乙酸乙酯将醛选择性烯烃化的有效催化剂,并提供了具有高(E)选择性的优异烯烃收率。PEG负载的催化剂5 通过沉淀和过滤可以很容易地将其回收,并且可以循环使用多达十次,而不会明显损失活性。