Synthesis and Reactivity of (C6F5)3BN-heterocycle Complexes, 2

✍ Scribed by Alessandra Bonazza; Isabella Camurati; Simona Guidotti; Nicoletta Mascellari; Luigi Resconi

• Book ID: 102486576
• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 242 KB
• Volume: 205
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200300132

✦ Synopsis

Abstract

Summary: The reaction of pyrroles and indoles with perfluoroarylboranes produces 1:1 B‐N complexes that contain highly acidic sp^3^ methylenes. These complexes are stable and can be used as a proton source for the generation of methylmetallocene cations. Indole is preferred over pyrrole. The 1:1:1 borane:indole:dimethylmetallocene compositions are, in some instances, more active than the 500:1 MAO:metallocene catalysts. In addition, the Ind~2~ZrMe~2~/IndoleB(C~6~F~5~)~3~ and related catalyst systems require a lower amount of AlR~3~ scavenger and are more stable compared to the Ind~2~ZrMe~2~/B(C~6~F~5~)~3~ catalyst. Also, Ind~2~ZrCl~2~/Al(i‐Bu)~3~/indoleB(C~6~F~5~)~3~ is an active catalyst system. In ethylene/propylene solution copolymerization catalyzed by Ind~2~ZrMe~2~, the most active cocatalysts are indoleB(C~6~F~5~)~3~ and 5‐benzyloxy‐indoleB(C~6~F~5~)~3~.

Formation of the catalyst system [Ind~2~ZrMe]^+^[B(indolyl)(C~6~F~5~)~3~]^−^.

imageFormation of the catalyst system [Ind~2~ZrMe]^+^[B(indolyl)(C~6~F~5~)~3~]^−^.