Synthesis and characterization of functional cyclopentasilanes

✍ Scribed by P. K. Jenkner; A. Spielberger; E. Hengge

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 405 KB
• Volume: 3
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.520030421

✦ Synopsis

Cleavage of the exocyclic Si-Si-bond of phenyl-dimethylsilylnonamethylcyclopentasiIane 3 by sodium ethoxide followed by chlorination with acetyl chloride leads to the monofunctional chlorononamethylcyclopentasilane 5. Subsequent hydration gives hydrononamethylcyclopentasilane 6, which can be easily converted to the corresponding bromo and iodo derivatives 7, 8. Fluorononamethylcyclopentasilane can be prepared upon treatment o f 7 with ZnF,. A different but convenient synthetic pathway to the halononamethyIcycIopentasilanes has also been achieved employing the corresponding trifluoromethanesulfonic acid ester 1 1. The halogen derivatives-as expected-show a strong influence on the physical properties of the compounds.

These functionalized cyclopentasilanes may serw as useful synthetic tools in building larger oligosilane ring systems.