Sulfuric acid-modified PEG-6000 (PEG–OSO3H): a biodegradable, reusable solid acid catalyst for highly efficient and eco-friendly synthesis of novel bis-Knoevenagel products under solvent-free conditions
作者:Zeba N. Siddiqui、Tabassum Khan
DOI:10.1016/j.tetlet.2013.05.012
日期:2013.7
PEG-6000 (PEG–OSO3H) is used as a highlyefficient, biodegradable, and reusable acid catalyst for the synthesis of novel acyclic and heterocyclic bis-Knoevenagel products under thermal solvent-free conditions. The remarkable features of this green, new methodology are high conversions, cleaner reaction profile, simple experimental and work-up procedure, and economic viability. The catalyst is characterized
Synthesis and characterization of the immobilized Ni–Zn–Fe layered double hydroxide (LDH) on silica-coated magnetite as a mesoporous and magnetically reusable catalyst for the preparation of benzylidenemalononitriles and bisdimedones (tetraketones) under green conditions
作者:Masumeh Gilanizadeh、Behzad Zeynizadeh
DOI:10.1039/c8nj00788h
日期:——
Magnetic Fe3O4@SiO2@Ni–Zn–Fe LDH was prepared as an efficient nanocatalyst for the Knoevenagel and tandem Knoevenagel–Michael reactions to afford the products in water.