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