Silsesquioxanes as models of silica supported catalyst I. [3-(Diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] and [3-mercapto-propyl]-hepta[propyl]-[octasilsesquioxane] as ligands for transition-metal ions

✍ Scribed by Benedikt J. Hendan; Heinrich C. Marsmann

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 87 KB
• Volume: 13
• Category: Article
• ISSN: 0268-2605
• DOI: 10.1002/(sici)1099-0739(199904)13:4<287::aid-aoc844>3.0.co;2-p

✦ Synopsis

The ligand [3-(diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] (dpps) can be prepared by reacting [3-chloropropyl]-hepta-[propyl]-[octasilsesquioxane] (cs) with KP(Ph

) 2 . The transition-metal complexes [Rh(CO)(dpps) 2 Cl], [Rh(COD)(dpps)Cl] and [Pt(dpps) 2 Cl 2 ] are synthesized as models of functionalized silica-gel surfaces. Without destruction of the siloxane cage, the intermediate compounds Hg(ss) 2 , and Pb(ss) 2 are obtained from [3-mercaptopropyl]hepta[propyl]-[octasilsesquioxane] (ssH). Starting from Pb(ss) 2 , the transition-metal complexes [Au(ss)(P(Ph) 3 )], [Rh(ss)(CO) 2 ] 2 and [Rh(ss) (COD)] 2 are accessible. The compounds have been characterized mostly by 1 H, 13 C, 29 Si and 31P NMR spectroscopy.