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Related Experiment Video

Updated: Jul 3, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Published on: April 9, 2018

Metallocenium incorporated charge-enhanced thiourea catalysts.

Daniel R Blechschmidt¹, Cal Mergendahl¹, Steven R Kass¹

¹Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455, USA. kass@umn.edu.

Organic & Biomolecular Chemistry

|February 12, 2024

Summary

This summary is machine-generated.

New metallocenium catalysts efficiently catalyze Friedel-Crafts alkylation reactions. These positively charged compounds, featuring iron or cobalt, show enhanced activity compared to neutral forms, enabling novel catalytic applications.

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Last Updated: Jul 3, 2025

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Area of Science:

Organometallic Chemistry
Catalysis
Organic Synthesis

Background:

Metallocenium salts are cationic organometallic compounds with potential catalytic applications.
Friedel-Crafts alkylation is a fundamental reaction in organic synthesis for forming carbon-carbon bonds.

Purpose of the Study:

To synthesize and characterize novel metallocenium derivatives as catalysts.
To evaluate the catalytic activity of these compounds in Friedel-Crafts alkylation reactions.
To explore the role of Lewis and Brønsted acidity in their catalytic performance.

Main Methods:

Synthesis of N-ferrocenium-N'-phenylthiourea and N-cobaltocenium-N'-phenylthiourea derivatives.
Catalytic testing in the Friedel-Crafts alkylation of indoles with trans-β-nitrostyrenes.
Characterization of compounds, including X-ray crystallography for the cobalt analog.

Main Results:

Successfully prepared three metallocenium salts (4a, 4b, 5) with tetrakis-[3,5-bis(trifluoromethyl)phenyl]borate (BArF4) counterions.
Demonstrated high catalytic activity in Friedel-Crafts alkylation, outperforming reduced, neutral analogues.
Identified dual Lewis and Brønsted acidic sites enabling charge-activated catalysis.

Conclusions:

Metallocenium salts are effective catalysts for Friedel-Crafts alkylation.
The cationic nature and dual acidity of these compounds are key to their enhanced catalytic activity.
Cobalt-containing metallocenium thiourea offers superior stability for isolation and characterization.