ABSTRACT

For the first time, chemical modification of raw Luffa with hydrogen sulfate moieties was investigated. For this purpose ammonium hydrogen sulfate moieties were immobilized on the surface of Luffa. This chemical modification performed by reaction of 3-aminopropyltriethoxy silane with raw Luffa and sulfonation of amine groups using sulfuric acid. The morphology of catalyst was investigated by Fourier transform spectroscopy, X-ray diffraction, thermogravimetric analysis, field emission scanning electron microscope, elemental-mapping, and energy dispersive X-Ray spectroscopy techniques. The catalytic performance of the synthesized catalyst was examined in the synthesis of coumarin and bis(indolyl)methane derivatives. Our method introduced a green protocol in using of a plant for the preparation of catalyst and one-pot solventless media for the synthesis of coumarins and bis(indolyl)methanes. Some of the advantages of our method are high yields of products, short reaction times, recyclability of catalyst, easy workup, and separation of catalyst and products.

摘要

首次研究了用硫酸氢基团对粗丝瓜的化学改性。为此目的，将硫酸氢铵部分固定在丝瓜表面上。通过3-氨基丙基三乙氧基硅烷与粗丝瓜反应和使用硫酸磺化胺基进行化学修饰。通过傅立叶变换光谱，X射线衍射，热重分析，场发射扫描电子显微镜，元素映射和能量色散X射线光谱技术研究了催化剂的形态。在香豆素和双（吲哚基）甲烷衍生物的合成中检查了合成催化剂的催化性能。我们的方法引入了一种绿色方案，即使用一种工厂来制备催化剂和一锅无溶剂介质来合成香豆素和双（吲哚基）甲烷。我们方法的一些优点是产物的产率高，反应时间短，催化剂的可回收性，后处理容易以及催化剂和产物的分离。