Silver-loaded TiO2 (Ag–TiO2) and acidic clay (K10 montmorillonite) composite photocatalyst has been successfully applied for the light-induced conversion of o-phenylenediamine (OPD) and its derivatives to substituted benzimidazoles with various alcohols in acetonitrile using UV-A and solar light. The influence of the various photocatalysts, solvents, and substituents on the yield and selectivity of the products has been investigated. The mechanism of photocatalysis is proposed. Loading silver on TiO2 enhances product yield and selectivity both in UV and solar light. In the presence of primary alcohols, 2-aminothiophenol forms only disulfide and hence Ag–TiO2/clay can be used as a green catalyst for the synthesis of disulfides.
负载
银的TiO2(Ag–TiO2)和酸性粘土(K10
蒙脱石)复合光催化剂已成功应用于紫外A和太阳光诱导的
邻苯二胺(OPD)及其衍
生物与多种醇在
乙腈中的光催化转化合成取代
苯并咪唑。考察了不同光催化剂、溶剂和取代基对产物收率和选择性的影响。提出了光催化机理。在TiO2上负载
银可以提高紫外和太阳光下产物的收率和选择性。在存在一级醇的情况下,2-
氨基
硫酚仅形成二
硫化物,因此Ag–TiO2/粘土可用作合成二
硫化物的绿色催化剂。