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Light‐Induced Rearrangement of Thioether‐Substituted Phosphanide Ligands: Scope and Limitations of a Remarkable Isomerization

Izod, K., Clark, E.R., Foster, P., Percival, R.J., Riddlestone, Ian M., Clegg, W. and Harrington, R.W. (2013) Light‐Induced Rearrangement of Thioether‐Substituted Phosphanide Ligands: Scope and Limitations of a Remarkable Isomerization Chemistry - A European Journal, 19 (19). pp. 6094-6107.

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Abstract

Treatment of the thioether‐substituted secondary phosphanes R2PH(C6H4‐2‐SR1) [R2=(Me3Si)2CH, R1=Me (1PH), iPr (2PH), Ph (3PH); R2=tBu, R1=Me (4PH); R2=Ph, R1=Me (5PH)] with nBuLi yields the corresponding lithium phosphanides, which were isolated as their THF (1–5Pa) and tmeda (1–5Pb) adducts. Solid‐state structures were obtained for the adducts [R2P(C6H4‐2‐SR1)]Li(L)n [R2=(Me3Si)2CH, R1=nPr, (L)n=tmeda (2Pb); R2=(Me3Si)2CH, R1=Ph, (L)n=tmeda (3Pb); R2=Ph, R1=Me, (L)n=(THF)1.33 (5Pa); R2=Ph, R1=Me, (L)n=([12]crown‐4)2 (5Pc)]. Treatment of 1PH with either PhCH2Na or PhCH2K yields the heavier alkali metal complexes [{(Me3Si)2CH}P(C6H4‐2‐SMe)]M(THF)n [M=Na (1Pd), K (1Pe)]. With the exception of 2Pa and 2Pb, photolysis of these complexes with white light proceeds rapidly to give the thiolate species [R2P(R1)(C6H4‐2‐S)]M(L)n [M=Li, L=THF (1Sa, 3Sa–5Sa); M=Li, L=tmeda (1Sb, 3Sb–5Sb); M=Na, L=THF (1Sd); M=K, L=THF (1Se)] as the sole products. The compounds 3Sa and 4Sa may be desolvated to give the cyclic oligomers [[{(Me3Si)2CH}P(Ph)(C6H4‐2‐S)]Li]6 ((3S)6) and [[tBuP(Me)(C6H4‐2‐S)]Li]8 ((4S)8), respectively. A mechanistic study reveals that the phosphanide–thiolate rearrangement proceeds by intramolecular nucleophilic attack of the phosphanide center at the carbon atom of the substituent at sulfur. For 2Pa/2Pb, competing intramolecular β‐deprotonation of the n‐propyl substituent results in the elimination of propene and the formation of the phosphanide–thiolate dianion [{(Me3Si)2CH}P(C6H4‐2‐S)]2−.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Izod, K.
Clark, E.R.
Foster, P.
Percival, R.J.
Riddlestone, Ian M.i.riddlestone@surrey.ac.uk
Clegg, W.
Harrington, R.W.
Date : 2 May 2013
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1002/chem.201203918
Uncontrolled Keywords : Alkali metal; P ligand; Photolysis; Rearrangement; Sulfur
Depositing User : Clive Harris
Date Deposited : 24 Jun 2019 13:03
Last Modified : 24 Jun 2019 13:04
URI: http://epubs.surrey.ac.uk/id/eprint/852029

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