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Lookup NU author(s): Dr Keith Izod, Dr Corinne Wills, Professor William Clegg, Dr Ross Harrington
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The reaction between either Mgl2 or Cal2 and 2 equiv of [(Me3Si)2{Me2(H3B)P}C]K (2) in toluene gives the corresponding organo-alkaline earth metal compounds [(Me 3Si)2{Me2(H3B)P}C]2M in moderate to good yields [M = Mg (3), Ca (4)]. Compound 3 crystallizes solvent-free, whereas X-ray quality crystals of 4 could not be obtained in the absence of coordinating solvents; crystallization of 4 from cold methylcyclohexane/THF gives the solvate [(Me3Si)2{Me 2(H3B)P}C]2Ca(THF)4 (4a). The corresponding heavier alkaline earth metal complexes [(Me3Si) 2{Me2-(H3B)P}C]2M(THF)5 [M = Sr (7), Ba (8)] are obtained from the reaction between Ml2 and 2 equiv of 2 in THF, followed by recrystallization from cold methylcyclohexane/ THF. Compound 3 degrades over a period of several weeks at room-temperature both in the solid state and in toluene solution to give the free phosphine-borane (Me3-Si)2{Me2(H3B)P}CH (5) as the sole phosphorus-containing product. In addition, compounds 3, 4, and 4a react rapidly with THF in toluene solution, yielding 5 as the sole phosphorus-containing product; in contrast, compounds 7 and 8 are stable toward this solvent. © 2007 American Chemical Society.
Author(s): Izod K, Wills C, Clegg W, Harrington RW
Publication type: Article
Publication status: Published
Journal: Inorganic Chemistry
Year: 2007
Volume: 46
Issue: 10
Pages: 4320-4325
ISSN (print): 0020-1669
ISSN (electronic): 1520-510X
Publisher: American Chemical Society
URL: http://dx.doi.org/10.1021/ic062459l
DOI: 10.1021/ic062459l
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