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Isolable Copper(I) η²-Cyclopropene Complexes.

Anurag Noonikara-Poyil¹, Shawn G Ridlen¹, H V Rasika Dias¹

¹Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, United States.

Inorganic Chemistry

|November 9, 2020

Summary

This summary is machine-generated.

Copper complexes with bis(pyrazolyl)borate ligands stabilize cyclopropene structures. These complexes also catalyze cyclopropene synthesis via [2+1]-cycloaddition reactions, expanding their utility in organometallic chemistry.

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Area of Science:

Organometallic Chemistry
Catalysis
Ligand Design

Background:

Bis(pyrazolyl)borate ligands are versatile in stabilizing metal complexes.
Copper(I) complexes are known catalysts for cycloaddition reactions.
Cyclopropenes are strained cyclic alkenes with unique reactivity.

Purpose of the Study:

To synthesize and characterize novel copper(I) cyclopropene complexes.
To investigate the catalytic activity of copper complexes in [2+1]-cycloaddition reactions.
To explore the influence of ligand structure on complex formation and reactivity.

Main Methods:

Synthesis of copper(I) complexes supported by [(CF3)2Bp] and [(CF3)2Tp] ligands.
Reaction of copper complexes with 1,2,3-trisubstituted cyclopropenes.
Catalytic [2+1]-cycloaddition of alkynes with ethyl diazoacetate.
Characterization using solution and solid-state analytical techniques.

Main Results:

Thermally stable copper(I) η2-cyclopropene complexes were successfully synthesized.
The [(CF3)2Bp]Cu(NCMe) complex catalyzed the formation of cyclopropenes.
Tris(pyrazolyl)borate [(CF3)2Tp]Cu(NCMe) also demonstrated catalytic competence.
An O-bonded complex was observed with a specific cyclopropene substrate and [(CF3)2Tp]Cu.

Conclusions:

Bis(pyrazolyl)borate ligands effectively stabilize copper(I) cyclopropene complexes.
Copper complexes are efficient catalysts for synthesizing cyclopropenes.
Ligand and substrate structure influence the coordination mode and reactivity of copper complexes.