Very efficient, reusable copper catalyst for carbene transfer reactions under biphasic conditions using ionic liquids

Area of Science:

• Organometallic Chemistry
• Catalysis
• Green Chemistry

Background:

• Ethyl diazoacetate is a versatile precursor for carbene transfer reactions.
• Developing efficient and reusable catalysts is crucial for sustainable chemical synthesis.
• Biphasic reaction systems can simplify product separation and catalyst recovery.

Purpose of the Study:

• To investigate the catalytic activity of a novel copper complex for carbene transfer reactions.
• To evaluate the efficiency of biphasic conditions using ionic liquids for this transformation.
• To assess the recyclability and stability of the catalyst.

Main Methods:

• Synthesis and characterization of the copper catalyst {[HC(3,5-Me(2)pz)(3)]Cu(NCMe)}BF(4).
• Carrying out carbene transfer reactions using ethyl diazoacetate as the carbene source.
• Employing a biphasic system with the ionic liquid [bmim][PF(6)] and hexane as the reaction medium.

Main Results:

• The copper catalyst efficiently mediated the transfer of the :CHCO(2)Et unit to various saturated and unsaturated substrates.
• High yields were achieved under the optimized biphasic conditions.
• The catalyst demonstrated excellent stability and reusability over multiple reaction cycles without any loss of catalytic activity.

Conclusions:

• The {[HC(3,5-Me(2)pz)(3)]Cu(NCMe)}BF(4) complex is a highly effective catalyst for carbene transfer reactions.
• The use of ionic liquid-based biphasic systems offers a green and efficient approach for this type of catalysis.
• The catalyst's reusability supports its potential for industrial applications.