Sustainable and Advanced LED-Implanted Microfluidic Photoreactor with Coupled Optical Fiber Enabling Efficient...

Area of Science:

• Organic Chemistry
• Chemical Engineering
• Analytical Chemistry

Background:

• Conventional photoinduced synthesis of benzimidazoles requires optimization for safety, energy efficiency, and reaction time.
• In-process monitoring is crucial for maximizing yield and ensuring consistent product formation.

Purpose of the Study:

• To develop a novel optofluidic Lab-on-a-Chip technology for enhanced benzimidazole derivative synthesis.
• To achieve safer, energy-efficient, and expedited synthesis with real-time monitoring.

Main Methods:

• Utilized LED-embedded microfluidic reactors for photoinduced condensation cyclization reactions.
• Employed Rose Bengal/fluorescein as a photocatalyst for reactions between aryl aldehydes and o-phenylenediamines.
• Integrated a reaction-monitoring microfluidic device for real-time UV-vis spectroscopic analysis.

Main Results:

• Achieved good to excellent yields (85-94%) of benzimidazole derivatives.
• Significantly reduced reaction time to 10 minutes compared to batch methods (2-3 hours).
• Demonstrated consistent spectroscopic observations with minimized light source interference.

Conclusions:

• The optofluidic Lab-on-a-Chip system offers a promising breakthrough for organic synthesis.
• This method enhances safety, minimizes chemical waste, maximizes atom economy, and is energy-efficient.
• Real-time in-process monitoring ensures controlled and optimized synthesis of benzimidazole derivatives.