## 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 o
Sterically Hindered Cyclic Diynes — Syntheses and Structures.
✍ Scribed by Carsten Schaefer; Rolf Gleiter; Frank Rominger
- Book ID
- 101952554
- Publisher
- John Wiley and Sons
- Year
- 2003
- Weight
- 118 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0931-7597
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📜 SIMILAR VOLUMES
## Abstract **The cover picture shows** on the left‐hand side a sterically hindered cyclic diyne and its synthesis. The packing of the molecules in the crystal is depicted in the center. Within the crystal weak intermolecular interactions were found that are illustrated on the right‐hand side. For
The cycloadduct 5, prepared from adamantanethione S-methylide with dimethyl azodicarboxylate, exists in solution in two conformations P and Q (70:30 in CDCI3), which are selm~ted by a barrier of AG~ 18.3 + 0.6 kcal mol-I; according to NMR spectra, both forms are chiral. Steric hindrance to 3'N-CO2CH