Formation of the [(s-trans-η4-Butadiene)TaCp*Cp]+ Cation and Its Reaction with Organic Carbonyl Derivatives
✍ Scribed by Hans Christian Strauch; Gerhard Erker; Roland Fröhlich; Maija Nissinen
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 331 KB
- Volume
- 1999
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Group-5 bent metallocene cation complexes / (Butadiene)tantalocene cation / (s-trans-η 4 -Butadiene)metal complex / Ethene polymerization / Metallocenes / Homogeneous catalysis (Butadiene)TaCp*Cl 2 (6) was treated with CpNa to yield (η 2 -cation complex 8 reacts with ketones (acetone, adamantanone) to yield the corresponding seven-membered butadiene)TaCp*CpCl (7). Subsequent reaction with [Cp 2 ZrCH 3 + ][CH 3 B(C 6 F 5 ) 3 -] resulted in transfer of the 2-tantalatetrahydrooxepine cation complexes (9, 10). 1-Cyanoadamantane reacts with 8 to yield the 2-tantala-3,6-chloride ligand from tantalum to zirconium with formation of the [(s-trans-η 4 -butadiene)TaCp*Cp] + cation [8, with dihydro-2H-azepine cation system 11. Activation of 8 with methylalumoxane gives an active ethene polymerization CH 3 B(C 6 F 5 ) 3 anion]. Complex 8 was characterized spectroscopically and by an X-ray crystal structure analysis. catalyst. The group-5 [(s-trans-η 4 -C 4 H 6 )TaCp*Cp] + bent metallocene to be the first simple cationic group-5 equivalent of the