Du, Jingzhen and Balazs, Gabor and Wooles, Ashley J. and Scheer, Manfred and Liddle, Stephen T. (2021) The "Hidden" Reductive [2+2+1]-Cycloaddition Chemistry of 2-Phosphaethynolate Revealed by Reduction of a Th-OCP Linkage. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 60 (3). pp. 1197-1202. ISSN 1433-7851, 1521-3773
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The reduction chemistry of the newly emerging 2-phosphaethynolate (OCP)(-) is not well explored, and many unanswered questions remain about this ligand in this context. We report that reduction of [Th(Tren(TIPS))(OCP)] (2, Tren(TIPS)=[N(CH2CH2NSiPr3i)](3-)), with RbC8 via [2+2+1] cycloaddition, produces an unprecedented hexathorium complex [{Th(Tren(TIPS))}(6)(mu-OC2P3)(2)(mu-OC2P3H)(2)Rb-4] (5) featuring four five-membered [C2P3] phosphorus heterocycles, which can be converted to a rare oxo complex [{Th(Tren(TIPS))(mu-ORb)}(2)] (6) and the known cyclometallated complex [Th{N(CH2CH2NSiPr3i)(2)((CH2CH2SiPr2CHMeCH2)-C-i)}] (4) by thermolysis; thereby, providing an unprecedented example of reductive cycloaddition reactivity in the chemistry of 2-phosphaethynolate. This has permitted us to isolate intermediates that might normally remain unseen. We have debunked an erroneous assumption of a concerted fragmentation process for (OCP)(-), rather than cycloaddition products that then decompose with [Th(Tren(TIPS))O](-) essentially acting as a protecting then leaving group. In contrast, when KC8 or CsC8 were used the phosphinidiide C-H bond activation product [{Th(Tren(TIPS))}Th{N(CH2CH2NSiPr3i)(2)[(CH2CH2SiPr2CH)-C-i(Me)CH2C(O)mu-P]}] (3) and the oxo complex [{Th(Tren(TIPS))(mu-OCs)}(2)] (7) were isolated.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGAND MULTIPLE BONDS; MOLECULAR-STRUCTURES; HYDRIDE CHEMISTRY; SANDWICH COMPLEX; PHOSPHA-ALKYNE; THORIUM; CLEAVAGE; REACTIVITY; CRYSTAL; ACTIVATION; 2-phosphaethynolate; actinides; phosphorus heterocycles; reduction; thorium |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Manfred Scheer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 May 2021 12:38 |
| Last Modified: | 17 May 2021 12:38 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43105 |
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