The synthesis and characterization of proposed reaction intermediates in olefin polymerization, hydrosilation and hydrogenation processes catalyzed by electrophilic Co(III)-alkyl complexes is the subject of Chapter 3. Cleavage of the Co-alkyl bond by dihydrogen or silane is postulated to proceed through either an oxidative addition - reductive elimination sequence or a sigma-bond metathesis pathway. To gain further insight into these two pathways, the reactions of cationic Co(III)-ethyl complexes with H2 and silanes have been examined. Low temperature 1H and 29Si NMR experiments used to establish the bonding interactions of these substitutionally labile and thermally unstable sigma-complex intermediates as well as relevant dynamic processes are described.GC analysis was performed on an Agilent 6850 Series GC System using a J. aamp; W . Scientific HP-1 column (100% dimethylpolysiloxane, 30 m x 0.32 mm i.d., 0.25 I¼m film thickness; temperature progression: 3 min. isothermal at 50AdC, 10AdC/min.
|Title||:||Synthesis and Catalytic Reactions of Electrophilic Late Metal Complexes|
|Publisher||:||ProQuest - 2007|