A Greener Pathway to Enantiopurity: Mechanochemical Deracemization through Abrasive Grinding

Area of Science:

• Organic Chemistry
• Green Chemistry
• Materials Science

Background:

• Chiral molecules are crucial in pharmaceuticals and agrochemicals.
• Traditional methods for obtaining enantiopure compounds can be time-consuming and environmentally taxing.
• Scalemic mixtures require efficient deracemization techniques.

Purpose of the Study:

• To introduce the first mechanochemical deracemization method using liquid-assisted abrasive grinding.
• To develop a faster and greener process for producing enantiopure materials.
• To demonstrate the efficacy of this method on a precursor of Paclobutrazol.

Main Methods:

• Liquid-assisted abrasive grinding for mechanochemical deracemization.
• Utilizing a precursor of Paclobutrazol as the target molecule.
• Analysis of enantiomeric excess (ee) to quantify the deracemization efficiency.

Main Results:

• Successful mechanochemical deracemization was achieved using liquid-assisted abrasive grinding.
• A 10% ee scalemic mixture was transformed into a 97% ee enantioenriched product.
• The process was completed in a few hours, significantly faster than solution-based methods.

Conclusions:

• Mechanochemical deracemization via liquid-assisted grinding is a viable and efficient technique.
• This method offers a greener and substantially faster route to enantiopure compounds.
• The study presents a novel approach for synthesizing chiral molecules relevant to agrochemicals.