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Synthesis, structures and stabilities of thioanisole-functionalised phosphido-borane complexes of the alkali metals

Lookup NU author(s): Dr Keith Izod, Julia Watson, Professor William Clegg, Dr Ross Harrington

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Abstract

Treatment of the secondary phosphine {(Me3Si)(2)CH}PH(C6H4-2-SMe) with BH3 center dot SMe2 gives the corresponding phosphine-borane {(Me3Si)(2)CH}PH(BH3)(C6H4-2-SMe) (9) as a colourless solid. Deprotonation of 9 with n-BuLi, PhCH2Na or PhCH2K proceeds cleanly to give the corresponding alkali metal complexes [[{(Me3Si)(2)CH} P(BH3)(C6H4-2-SMe)]ML](n) [ML = Li(THF), n = 2 (10); ML = Na(tmeda), n = infinity (11); ML = K(pmdeta), n = 2 (12)] as yellow/orange crystalline solids. X-ray crystallography reveals that the phosphido-borane ligands bind the metal centres through their sulfur and phosphorus atoms and through the hydrogen atoms of the BH3 group in each case, leading to dimeric or polymeric structures. Compounds 10-12 are stable towards both heat and ambient light; however, on heating in toluene solution in the presence of 10, traces of free phosphine-borane 9 are slowly converted to the free phosphine {(Me3Si)(2)CH}PH(C6H4-2-SMe) (5) with concomitant formation of the corresponding phosphido-bis(borane) complex [{(Me3Si)(2)CH} P(BH3)(2)(C6H4-2-SMe)]Li (14).

Publication metadata

Author(s): Izod K, Watson JM, Clegg W, Harrington RW

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2011

Volume: 40

Issue: 44

Pages: 11712-11718

Print publication date: 01/09/2011

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1039/c1dt11368b

DOI: 10.1039/c1dt11368b

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