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Alkaline earth metal complexes of a phosphine-borane-stabilized carbanion: Synthesis, structures, and stabilities

Lookup NU author(s): Dr Keith Izod, Dr Corinne Wills, Emeritus Professor Bill CleggORCiD, 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.

Publication metadata

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


DOI: 10.1021/ic062459l


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