Sterically hindered cyclic diynes

• Verfasst von: Schaefer, Carsten [VerfasserIn]
• Verfasst von: Gleiter, Rolf [VerfasserIn]
• Verfasst von: Rominger, Frank [VerfasserIn]
• Titel: Sterically hindered cyclic diynes
• Titelzusatz: syntheses and structures
• Verf.angabe: Carsten Schaefer, Rolf Gleiter, and Frank Rominger
• E-Jahr: 2003
• Jahr: 22 July 2003
• Umfang: 9 S.
• Teil: year:2003
• Teil: number:16
• Teil: pages:3051-3059
• Teil: extent:9
• Fussnoten: Gesehen am 27.10.2020
• Titel Quelle: Enthalten in: European journal of organic chemistry
• Ort Quelle: Weinheim : Wiley-VCH Verl., 1998
• Jahr Quelle: 2003
• Band/Heft Quelle: (2003), 16, Seite 3051-3059
• ISSN Quelle: 1099-0690
• DOI: doi:10.1002/ejoc.200300151
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Alkynes
• Sach-SW: Cobalt
• Sach-SW: Heterocycles
• Sach-SW: Intermolecular forces
• Sach-SW: Steric hindrance
• K10plus-PPN: 1736676415

Abstract

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)