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Related Experiment Video

Updated: May 15, 2025

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments

Published on: May 11, 2017

Allosteric Differentiation of Al(I) Reactivity.

Han-Ying Liu¹, Jakub Kenar¹, Henry T W Shere¹

¹Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|April 11, 2025

Summary

This summary is machine-generated.

Dimeric potassium alumanyl reacts with alkynes to form aluminacyclopropenes. With controlled stoichiometry, it also undergoes phenyl C-H activation, suggesting cooperative steps and allosteric kinetic discrimination.

Keywords:

alkyne aluminum arene activation cycloaddition density functional theory

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Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

Published on: November 7, 2016

Area of Science:

Organometallic Chemistry
Main Group Chemistry
Synthetic Chemistry

Background:

Potassium alumanyl complexes are versatile reagents in organometallic synthesis.
Alkyne cycloaddition reactions are fundamental in constructing cyclic organic frameworks.
Understanding reaction selectivity and mechanisms is crucial for developing new synthetic methodologies.

Purpose of the Study:

To investigate the reactivity of dimeric potassium alumanyl with various alkynes.
To explore the influence of stoichiometry on reaction outcomes, including cycloaddition and C-H activation.
To elucidate the mechanistic pathways governing these transformations.

Main Methods:

Synthesis and characterization of dimeric potassium alumanyl.
Reactions with substituted phenylalkynes under varying stoichiometric conditions.
Spectroscopic analysis (NMR) and X-ray crystallography for product identification.
Computational studies (theoretical calculations) to support mechanistic proposals.

Main Results:

Exclusive formation of aluminacyclopropene derivatives when using two equivalents of alkyne.
Co-occurrence of alkyne cycloaddition and para-C-H activation of phenyl substituents with equimolar stoichiometry.
Identification of cooperative steps and allosterically influenced kinetic discrimination in the observed selectivity.

Conclusions:

Stoichiometry plays a critical role in directing the reactivity of dimeric potassium alumanyl towards either cycloaddition or C-H activation.
The observed selectivity is attributed to a combination of cooperative effects and kinetic control.
This study provides insights into the complex reaction mechanisms involving main group organometallic reagents and unsaturated substrates.