Synthesis and solid state structures of tri-t-butyl-cyclopropenyl derivatives of main group elements: Cyp*MPh3 (M = Si, Ge, Sn) |
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Authors: | Zi-Ye Hua |
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Affiliation: | Department of Chemistry, Tulane University, New Orleans, LA 70118, United States |
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Abstract: | The reaction of Ph3MLi (M = Si, Ge, and Sn) with tri-t-butylcyclopropenium tetrafluoroborate gives the cyclopropenyl compounds Cyp*MPh3 as air and moisture stable solids in 11%, 74%, and 77% yields, respectively. Attempts to prepare Cyp*PbPh3 by this method were unsuccessful. The X-ray crystal structures of all three of these compounds were obtained. The M-C(Cyp*) bond distances increase with the order: Sn-C (2.19 Å) > Ge-C (2.00 Å) > Si-C (1.91 Å). A high degree of steric strain is evidenced for the silicon derivative which forms an exocyclic bond angle (Si-C(Cyp*)-C(tBu)) of 121.6°. The high degree of steric strain for the silicon analog is believed to be responsible for the low yields for its synthesis. |
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Keywords: | Cyclopropene Silane Germane Stannane Synthesis Crystal structure |
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