1
|
Nguyen THV, Chelli S, Mallet-Ladeira S, Breugst M, Lakhdar S. Reactivity of the phosphaethynolate anion with stabilized carbocations: mechanistic studies and synthetic applications. Chem Sci 2024:d4sc03518f. [PMID: 39165734 PMCID: PMC11331332 DOI: 10.1039/d4sc03518f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2024] [Accepted: 07/27/2024] [Indexed: 08/22/2024] Open
Abstract
The reactivity of sodium phosphaethynolate Na(OCP) towards various Mayr's reference electrophiles was investigated using conventional UV-visible and laser-flash photolysis techniques. The kinetic data, along with density functional theory (DFT) calculations, enabled the first experimental quantification of the phosphorus nucleophilicity of [OCP]-. Product studies of these reactions demonstrate the formation of secondary as well as tertiary phosphines. The mechanism of this unprecedented phosphorus-atom transfer reaction is thoroughly discussed, with key intermediates successfully isolated and characterized. Importantly, some bulky secondary phosphine oxides synthesized using this approach, have demonstrated high efficiency as ligands in the Suzuki coupling reaction.
Collapse
Affiliation(s)
- Thi Hong Van Nguyen
- CNRS, Université Paul Sabatier, Laboratoire Hetérochimie Fondamentale et Appliquée (LHFA, UMR5069) 118 Route de Narbonne 31062 Cedex 09 Toulouse France
| | - Saloua Chelli
- CNRS, Université Paul Sabatier, Laboratoire Hetérochimie Fondamentale et Appliquée (LHFA, UMR5069) 118 Route de Narbonne 31062 Cedex 09 Toulouse France
| | - Sonia Mallet-Ladeira
- Institut de Chimie de Toulouse (FR 2599) 118 Route de Narbonne 31062 Cedex 09 Toulouse France
| | - Martin Breugst
- Institut für Chemie, Technische Universität Chemnitz 09111 Chemnitz Germany
| | - Sami Lakhdar
- CNRS, Université Paul Sabatier, Laboratoire Hetérochimie Fondamentale et Appliquée (LHFA, UMR5069) 118 Route de Narbonne 31062 Cedex 09 Toulouse France
| |
Collapse
|
2
|
Bhunia M, Mohar JS, Sandoval-Pauker C, Fehn D, Yang ES, Gau M, Goicoechea J, Ozarowski A, Krzystek J, Telser J, Meyer K, Mindiola DJ. Softer Is Better for Titanium: Molecular Titanium Arsenido Anions Featuring Ti≡As Bonding and a Terminal Parent Arsinidene. J Am Chem Soc 2024; 146:3609-3614. [PMID: 38290427 DOI: 10.1021/jacs.3c12939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
We introduce the arsenido ligand onto the TiIV ion, yielding a remarkably covalent Ti≡As bond and the parent arsinidene Ti═AsH moiety. An anionic arsenido ligand is assembled via reductive decarbonylation involving the discrete TiII salt [K(cryptand)][(PN)2TiCl] (1) (cryptand = 222-Kryptofix) and Na(OCAs)(dioxane)1.5 in thf/toluene to produce the mixed alkali ate-complex [(PN)2Ti(As)]2(μ2-KNa(thf)2) (2) and the discrete salt [K(cryptand)][(PN)2Ti≡As] (3) featuring a terminal Ti≡As ligand. Protonation of 2 or 3 with various weak acids cleanly forms the parent arsinidene [(PN)2Ti═AsH] (4), which upon deprotonation with KCH2Ph in thf generates the more symmetric anionic arsenido [(PN)2Ti(As){μ2-K(thf)2}]2 (5). Experimental and computational studies suggest the pKa of 4 to be ∼23, and the bond orders in 2, 3, and 5 are all in the range of a Ti≡As triple bond, with decreasing bond order in 4.
Collapse
Affiliation(s)
- Mrinal Bhunia
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
| | - Jacob S Mohar
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
| | - Christian Sandoval-Pauker
- Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States
| | - Dominik Fehn
- Departments of Chemistry & Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen - Nürnberg (FAU), 91058 Erlangen, Germany
| | - Eric S Yang
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Michael Gau
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
| | - Jose Goicoechea
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Karsten Meyer
- Departments of Chemistry & Pharmacy, Inorganic Chemistry, Friedrich-Alexander-Universität Erlangen - Nürnberg (FAU), 91058 Erlangen, Germany
| | - Daniel J Mindiola
- Department of Chemistry, University of Pennsylvania, 231 S 34th St, Philadelphia, Pennsylvania 19104, United States
| |
Collapse
|
3
|
Basappa S, Bhawar R, Nagaraju DH, Bose SK. Recent advances in the chemistry of the phosphaethynolate and arsaethynolate anions. Dalton Trans 2022; 51:3778-3806. [PMID: 35108724 DOI: 10.1039/d1dt03994f] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Over the past decade, the reactivity of 2-phosphaethynolate (OCP-), a heavier analogue of the cyanate anion, has been the subject of momentous interest in the field of modern organometallic chemistry. It is used as a precursor to novel phosphorus-containing heterocycles and as a ligand in decarbonylative processes, serving as a synthetic equivalent of a phosphinidene derivative. This perspective aims to describe advances in the reactivities of phosphaethynolate and arsaethynolate anions (OCE-; E = P, As) with main-group element, transition metal, and f-block metal scaffolds. Further, the unique structures and bonding properties are discussed based on spectroscopic and theoretical studies.
Collapse
Affiliation(s)
- Suma Basappa
- Centre for Nano and Material Sciences (CNMS), Jain University, Jain Global Campus, Bangalore-562112, India.
| | - Ramesh Bhawar
- Centre for Nano and Material Sciences (CNMS), Jain University, Jain Global Campus, Bangalore-562112, India.
| | - D H Nagaraju
- Department of Chemistry, School of Applied Sciences, Reva University, Bangalore 560064, India.
| | - Shubhankar Kumar Bose
- Centre for Nano and Material Sciences (CNMS), Jain University, Jain Global Campus, Bangalore-562112, India.
| |
Collapse
|