Lipophilic lithium alkoxides or dialkylboroxides; X-ray structures of [Li(µ-OR′)]2and Li(OBR2)(tmeda), [tmeda =(Me2NCH2)2, R = CH(SiMe3)2, R′= CBut3or BR2]
- 1 January 1989
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 18,p. 1312-1314
- https://doi.org/10.1039/c39890001312
Abstract
Treatment of But 3COH or BR2OH [R = CH(SiMe3)2] with LiBun yields the colourless crystalline [Li(µ-OR′)]2, [R′= CBut 3(1) or BR2(2)]; the dialkylboroxide (2) reacts with tmeda [tmeda =(Me2NCH2)2], MeCOCI, or [Ti(η-C5H5)2Cl2] to yield Li(OBR2)(tmeda)(3), BR2OH, or [Ti(η-C5H5)2(Cl)(OBR2)], respectively; X-ray data on complexes (1)–(3) are compared with those for related LiO compounds, the two-co-ordinate lithium environment in (1) and (2), and the exceedingly short Li–O [1.677(5)Å] and O–B [1.308(8)Å] distances in (3) being noteworthy.Keywords
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