1
|
Stevens MP, Spray E, Vitorica-Yrezabal IJ, Singh K, Timmermann VM, Sotorrios L, Macgregor SA, Ortu F. Synthesis, characterisation and reactivity of group 2 complexes with a thiopyridyl scorpionate ligand. Dalton Trans 2022; 51:11922-11936. [PMID: 35876311 DOI: 10.1039/d2dt02012b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Herein we report the reactivity of the proligand tris(2-pyridylthio)methane (HTptm) with various Alkaline Earth (AE) reagents: (1) dialkylmagnesium reagents and (2) AE bis-amides (AE = Mg-Ba). Heteroleptic complexes of general formulae [Mg(Tptm)(R)] (R = Me, nBu; Tptm = {C(S-C5H4N)3}-) and [AE(Tptm)(N'')] (AE = Mg-Ba; N'' = {N(SiMe3)2}-) were targeted from the reaction of HTptm with R2Mg or [AE(N'')2]2. Reaction of the proligand with dialkylmagnesium reagents led to formation of [{Mg(κ3C,N,N-C{Bu}{S-C5H4N}2)(μ-S-C5H4N)}2] (1) and [{Mg(κ3C,N,N-C{Me}{S-C5H4N}2)(μ-OSiMe3)}2] (2) respectively, as a result of a novel transfer of an alkyl group onto the methanide carbon with concomitant C-S bond cleavage. However, reactivity of bis-amide precursors for Mg and Ca did afford the target species [AE(Tptm)(N'')] (3-AE; AE = Mg-Ca), although these proved susceptible to ligand degradation processes. DFT calculations show that alkyl transfer in the putative [Mg(Tptm)(nBu)] (1m') system and amide transfer in 3-Ca is a facile process that induces C-S bond cleavage in the Tptm ligand. 3-Mg and 3-Ca were also tested as catalysts for the hydrophosphination of selected alkenes and alkynes, including the first example of mono-hydrophosphination of 4-ethynylpyridine which was achieved with high conversions and excellent regio- and stereochemical control.
Collapse
Affiliation(s)
- Matthew P Stevens
- School of Chemistry, University of Leicester, University Road, LE1 7RH Leicester, UK.
| | - Emily Spray
- School of Chemistry, University of Leicester, University Road, LE1 7RH Leicester, UK.
| | | | - Kuldip Singh
- School of Chemistry, University of Leicester, University Road, LE1 7RH Leicester, UK.
| | - Vanessa M Timmermann
- School of Chemistry, University of Leicester, University Road, LE1 7RH Leicester, UK.
| | - Lia Sotorrios
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.
| | - Stuart A Macgregor
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.
| | - Fabrizio Ortu
- School of Chemistry, University of Leicester, University Road, LE1 7RH Leicester, UK.
| |
Collapse
|
2
|
Wolf BM, Anwander R. Chasing Multiple Bonding Interactions between Alkaline‐Earth Metals and Main‐Group Fragments. Chemistry 2019; 25:8190-8202. [DOI: 10.1002/chem.201901169] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Indexed: 01/06/2023]
Affiliation(s)
- Benjamin M. Wolf
- Institut für Anorganische ChemieUniversität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Reiner Anwander
- Institut für Anorganische ChemieUniversität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| |
Collapse
|
3
|
Sindlinger CP, Lawrence SR, Acharya S, Ohlin CA, Stasch A. PNacPNacE: (E = Ga, In, Tl) – monomeric group 13 metal(i) heterocycles stabilized by a sterically demanding bis(iminophosphoranyl)methanide. Dalton Trans 2017; 46:16872-16877. [DOI: 10.1039/c7dt04048b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Monomeric group 13 metal(i) complexes of gallium, indium and thallium stabilised by a sterically demanding bis(iminophosphoranyl)methanide ligand have been prepared and characterised.
Collapse
Affiliation(s)
| | | | | | | | - Andreas Stasch
- School of Chemistry
- Monash University
- Melbourne
- Australia
- EaStCHEM School of Chemistry
| |
Collapse
|