Sterically hindered cyclic diynes: syntheses and structures
The synthesis of three 14-membered ring systems 8a−8c with the 1,3,8,10-tetraoxa-2,9-disilacyclotetradeca-5,12-diyne skeleton is described. In all three ring systems the α-positions are substituted with gem-dimethyl and/or gem-diphenyl groups. Structural investigations on 8a and 8c reveal a chair li...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
22 July 2003
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| In: |
European journal of organic chemistry
Year: 2003, Heft: 16, Pages: 3051-3059 |
| ISSN: | 1099-0690 |
| DOI: | 10.1002/ejoc.200300151 |
| Online-Zugang: | Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1002/ejoc.200300151 Verlag, lizenzpflichtig, Volltext: https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/ejoc.200300151 
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| Verfasserangaben: | Carsten Schaefer, Rolf Gleiter, and Frank Rominger |
MARC
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| 520 | |a The synthesis of three 14-membered ring systems 8a−8c with the 1,3,8,10-tetraoxa-2,9-disilacyclotetradeca-5,12-diyne skeleton is described. In all three ring systems the α-positions are substituted with gem-dimethyl and/or gem-diphenyl groups. Structural investigations on 8a and 8c reveal a chair like conformation of the central ring with parallel alkyne units. For 8b the voluminous phenyl groups cause a twist-chair and a twist-boat conformation. Columnar structures were encountered for 8a in the solid state. Reactions with octacarbonyldicobalt yield for 8a mono- and biscomplexation (12, 13). For 8b only the mono complexation product 14 was isolated. For 8c the bis(hexacarbonyldicobalt) complex 15 was obtained. X-ray investigations revealed columnar structures in the solid state for 12, 13, and 15. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) | ||
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| 650 | 4 | |a Intermolecular forces | |
| 650 | 4 | |a Steric hindrance | |
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