Abdellattif, M.H.; Mokhtar, M. MgAl-Layered Double Hydroxide Solid Base Catalysts for Henry Reaction: A Green Protocol. Catalysts2018, 8, 133.
Abdellattif, M.H.; Mokhtar, M. MgAl-Layered Double Hydroxide Solid Base Catalysts for Henry Reaction: A Green Protocol. Catalysts 2018, 8, 133.
Abdellattif, M.H.; Mokhtar, M. MgAl-Layered Double Hydroxide Solid Base Catalysts for Henry Reaction: A Green Protocol. Catalysts2018, 8, 133.
Abdellattif, M.H.; Mokhtar, M. MgAl-Layered Double Hydroxide Solid Base Catalysts for Henry Reaction: A Green Protocol. Catalysts 2018, 8, 133.
Abstract
A series of MgAl-layered double hydroxide (MgAl-HT), the calcined form at 500oC (MgAlOx) and the re-hydrated one at 25oC (MgAl-HT-RH) were synthesized. Physicochemical properties of the catalysts were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM). Surface area of the as-synthesized, calcined and re-hydrated catalysts was determined by N2 physisorption at -196oC. CO2-teperature programmed desorption (CO2-TPD) was applied to determine the basic sites of catalysts. The catalytic test reaction was carried out using benzaldehyde and their derivatives with nitromethane and their derivatives. The Henry products (1-15) were obtained in a very good yield using MgAl-HT-RH catalyst either by conventional method at 90oC in liquid phase, or under microwave irradiation method. The mesoporous structure and basic nature of re-hydrated solid catalyst were responsible for their superior catalytic efficiency. The robust nature was determined by using the same catalyst for five times, where the product % yield was almost unchanged significantly.
Keywords
C-C bond formation; henry reaction; solid base catalyst; layered double hydroxide
Subject
Chemistry and Materials Science, Applied Chemistry
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Commenter:
The commenter has declared there is no conflict of interests.
and the results is promising