Pentacoordinate spirosilicate anion, bis(2,2′-biphenyldiyl)methylsilicate, synthesized by the lithium cleavage of dimethoxyethane |
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Authors: | David Ballweg Yuxia Liu Ilia A Guzei Robert West |
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Institution: | (1) Organosilicon Research Center, Department of Chemistry, University of Wisconsin, Madison, WI, 53706, U.S.A |
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Abstract: | The reaction of spirobisilafluorene (1) with lithium in dimethoxyethane produces lithium 1-methyl-spirobisilafluorenide (2), a stable pentacoordinate silicon compound with five carbon ligands, and lithium 2-methoxyethoxide, which was identified by trapping with Ph3SiCl to give Ph3Si-OCH2CH2OCH3 (4). The X-ray crystal structure of 2 shows that the geometry at silicon is an idealized trigonal bipyramid, slightly distorted toward a square pyramid. Methanolysis of 2 cleaves a Si-aryl bond producing a methyl biphenylsilafluorene, 3. Crystal structures are reported for 3 and 4. |
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Keywords: | hypercoordination spiro compound organosilicate anion radical |
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