On the ambiphilic reactivity of geometrically constrained phosphorusIII and arsenicIII compounds: Insights into their interaction with ionic substrates.Report as inadecuate




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Reference: Robinson, TP, Lo, S-K, De Rosa, D et al., (2016). On the ambiphilic reactivity of geometrically constrained phosphorus(III) and arsenic(III) compounds: Insights into their interaction with ionic substrates. Chemistry: A European Journal, 22 (44), 15712-15724.Citable link to this page:

 

On the ambiphilic reactivity of geometrically constrained phosphorus(III) and arsenic(III) compounds: Insights into their interaction with ionic substrates.

Abstract: The ambiphilic nature of geometrically constrained Group 15 complexes bearing the N,N-bis(3,5-di-tert-butyl-2-phenolate)amide pincer ligand (ONO(3-) ) is explored. Despite their differing reactivity towards nucleophilic substrates with polarised element-hydrogen bonds (e.g., NH3 ), both the phosphorus(III), P(ONO) (1 a), and arsenic(III), As(ONO) (1 b), compounds exhibit similar reactivity towards charged nucleophiles and electrophiles. Reactions of 1 a and 1 b with KOtBu or KNPh2 afford anionic complexes in which the nucleophilic anion associates with the pnictogen centre ([(tBuO)Pn(ONO)](-) (Pn=P (2 a), As (2 b)) and [(Ph2 N)Pn(ONO)](-) (Pn=P (3 a), As (3 b)). Compound 2 a can subsequently be reacted with a proton source or benzylbromide to afford the phosphorus(V) compounds (tBuO)HP(ONO) (4 a) and (tBuO)BzP(ONO) (5 a), respectively, whereas analogous arsenic(V) compounds are inaccessible. Electrophilic substrates, such as HOTf and MeOTf, preferentially associate with the nitrogen atom of the ligand backbone of both 1 a and 1 b, giving rise to cationic species that can be rationalised as either ammonium salts or as amine-stabilised phosphenium or arsenium complexes ([Pn{ON(H)O}](+) (Pn=P (6 a), As (6 b)) and [Pn{ON(Me)O}](+) (Pn=P (7 a), As (7 b)). Reaction of 1 a with an acid bearing a nucleophilic counteranion (such as HCl) gives rise to a phosphorus(V) compound HPCl(ONO) (8 a), whereas the analogous reaction with 1 b results in the addition of HCl across one of the As-O bonds to afford ClAs{(H)ONO} (8 b). Functionalisation at both the pnictogen centre and the ligand backbone is also possible by reaction of 7 a/7 b with KOtBu, which affords the neutral species (tBuO)Pn{ON(Me)O} (Pn=P (9 a), As (9 b)). The ambiphilic reactivity of these geometrically constrained complexes allows some insight into the mechanism of reactivity of 1 a towards small molecules, such as ammonia and water.

Publication status:PublishedPeer Review status:Peer reviewedVersion:Publisher's versionDate of acceptance:2016-08-02 Funder: SCG Innovation Fund   Funder: Engineering and Physical Sciences Research Council   Notes:© 2016 The Authors. Published by Wiley-VCH Verlag GmbH and Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Bibliographic Details

Publisher: Wiley

Publisher Website: http://www.wiley.com/3765

Journal: Chemistry: A European Journalsee more from them

Publication Website: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1521-3765

Volume: 22

Issue: 44

Extent: 15712-15724

Issue Date: 2016-09

pages:15712-15724Identifiers

Doi: https://doi.org/10.1002/chem.201603135

Issn: 1521-3765

Issn: 0947-6539

Uuid: uuid:a80d6b8d-6062-45f4-9a53-d11df0182495

Urn: uri:a80d6b8d-6062-45f4-9a53-d11df0182495

Pubs-id: pubs:645947 Item Description

Type: journal-article;

Language: eng

Version: Publisher's versionKeywords: arsenic phosphorus reaction mechanism structure elucidation

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Author: Robinson, TP - Oxford, MPLS, Chemistry, Inorganic Chemistry - - - Lo, S-K - Oxford, MPLS, Chemistry, Inorganic Chemistry - - - De

Source: https://ora.ox.ac.uk/objects/uuid:a80d6b8d-6062-45f4-9a53-d11df0182495



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