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Flexible Coordination of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes
[Image: see text] Aluminum hydrides, once a simple class of stoichiometric reductants, are now emerging as powerful catalysts for organic transformations such as the hydroboration or hydrogenation of unsaturated bonds. The coordination chemistry of aluminum hydrides supported by P donors is relative...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American
Chemical Society
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6727621/ https://www.ncbi.nlm.nih.gov/pubmed/31411460 http://dx.doi.org/10.1021/acs.inorgchem.9b01061 |
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author | Falconer, Rosalyn L. Nichol, Gary S. Cowley, Michael J. |
author_facet | Falconer, Rosalyn L. Nichol, Gary S. Cowley, Michael J. |
author_sort | Falconer, Rosalyn L. |
collection | PubMed |
description | [Image: see text] Aluminum hydrides, once a simple class of stoichiometric reductants, are now emerging as powerful catalysts for organic transformations such as the hydroboration or hydrogenation of unsaturated bonds. The coordination chemistry of aluminum hydrides supported by P donors is relatively underexplored. Here, we report aluminum dihydride and dimethyl complexes supported by amidophosphine ligands and study their coordination behavior in solution and in the solid state. All complexes exist as κ(2)-N,P complexes in the solid state. However, we find that for amidophosphine ligands bearing bulky aminophosphine donors, aluminum dihydride and dimethyl complexes undergo a “ligand-slip” rearrangement in solution to generate κ(2)-N,N complexes. Thus, importantly for catalytic activity, we find that the coordination behavior of the P donor can be modulated by controlling its steric bulk. We show that the reported aluminum hydrides catalyze the hydroboration of alkynes by HBPin and that the variable coordination mode exhibited by the amidophosphine ligand modulates the catalytic activity. |
format | Online Article Text |
id | pubmed-6727621 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American
Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-67276212019-09-06 Flexible Coordination of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes Falconer, Rosalyn L. Nichol, Gary S. Cowley, Michael J. Inorg Chem [Image: see text] Aluminum hydrides, once a simple class of stoichiometric reductants, are now emerging as powerful catalysts for organic transformations such as the hydroboration or hydrogenation of unsaturated bonds. The coordination chemistry of aluminum hydrides supported by P donors is relatively underexplored. Here, we report aluminum dihydride and dimethyl complexes supported by amidophosphine ligands and study their coordination behavior in solution and in the solid state. All complexes exist as κ(2)-N,P complexes in the solid state. However, we find that for amidophosphine ligands bearing bulky aminophosphine donors, aluminum dihydride and dimethyl complexes undergo a “ligand-slip” rearrangement in solution to generate κ(2)-N,N complexes. Thus, importantly for catalytic activity, we find that the coordination behavior of the P donor can be modulated by controlling its steric bulk. We show that the reported aluminum hydrides catalyze the hydroboration of alkynes by HBPin and that the variable coordination mode exhibited by the amidophosphine ligand modulates the catalytic activity. American Chemical Society 2019-08-14 2019-09-03 /pmc/articles/PMC6727621/ /pubmed/31411460 http://dx.doi.org/10.1021/acs.inorgchem.9b01061 Text en Copyright © 2019 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Falconer, Rosalyn L. Nichol, Gary S. Cowley, Michael J. Flexible Coordination of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes |
title | Flexible Coordination
of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes |
title_full | Flexible Coordination
of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes |
title_fullStr | Flexible Coordination
of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes |
title_full_unstemmed | Flexible Coordination
of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes |
title_short | Flexible Coordination
of N,P-Donor Ligands in Aluminum Dimethyl and Dihydride Complexes |
title_sort | flexible coordination
of n,p-donor ligands in aluminum dimethyl and dihydride complexes |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6727621/ https://www.ncbi.nlm.nih.gov/pubmed/31411460 http://dx.doi.org/10.1021/acs.inorgchem.9b01061 |
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