Facile and Highly Selective Deprotection of Aryl Propionates/Acetates Using a Supported Lewis Acid Catalyst (20%...

Area of Science:

• Organic Chemistry
• Catalysis
• Materials Science

Background:

• Selective deprotection of esters is crucial in organic synthesis.
• Developing robust and reusable solid acid catalysts remains a challenge.

Purpose of the Study:

• To synthesize and characterize a novel solid acid catalyst, 20% indium(III) chloride supported on mesoporous silica (InCl3/MCM-41).
• To investigate the catalyst's efficiency in the selective deprotection of substituted aryl esters to phenols.
• To evaluate the catalyst's stability and reusability.

Main Methods:

• Wet impregnation method for catalyst preparation.
• Characterization using textural analysis, microscopy, Lewis acidity quantification, and X-ray photoelectron spectroscopy (XPS).
• Selective deprotection reactions monitored by ICP-AES analysis.

Main Results:

• The InCl3/MCM-41 catalyst exhibited a well-ordered honeycomb structure with high indium dispersion.
• The catalyst achieved good yields in the selective deprotection of aryl acetates and propionates to phenols.
• The methodology showed selectivity in the presence of amides, and the catalyst was reusable for up to six cycles without activity loss.

Conclusions:

• The developed 20% InCl3/MCM-41 catalyst is a highly effective and reusable material for selective ester deprotection.
• The catalyst's robust nature and selectivity offer a promising alternative for synthetic applications.
• The material's properties and catalytic performance highlight its potential in green chemistry approaches.