Synthesis without solvent: consequences for mechanochemical reactivity

Area of Science:

• Chemistry
• Materials Science
• Synthetic Chemistry

Background:

• Solvents are traditionally essential in synthetic chemistry.
• Mechanochemical synthesis, using grinding or milling, often requires minimal or no solvent.
• This shift prompts a re-evaluation of solvent roles in chemical reactions.

Purpose of the Study:

• To explore the outcomes of chemical reactions conducted without solvents.
• To categorize reactions based on solvent presence: solvent-optional, liquid-assisted grinding (LAG), and solvent-free.
• To highlight the unique capabilities of mechanochemistry for inorganic and organometallic systems.

Main Methods:

• Review of existing literature on mechanochemical synthesis.
• Analysis of solvent-optional reactions where solvent presence has minimal impact.
• Examination of liquid-assisted grinding (LAG) and solvate-assisted grinding techniques.
• Case studies of mechanosynthesis and mechanocatalysis in inorganic and organometallic chemistry.

Main Results:

• Identified three categories of reactions concerning solvent use in mechanochemistry.
• Demonstrated that mechanochemistry can yield products unobtainable through solution-based methods.
• Highlighted the importance of understanding solvent's role, even in limited quantities (LAG).
• Discussed the depiction and description of mechanochemical processes and LAG.

Conclusions:

• Mechanochemistry offers viable solvent-free or reduced-solvent synthetic pathways.
• This approach expands synthetic possibilities, particularly for inorganic and organometallic compounds.
• Further research into mechanochemical methods and descriptions is warranted.