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Synthesis and Structure of the Dicationic Bisborate Adduct [(tBu3PN)2Ti{μ-MeB(C6F5)3}2]

✍ Scribed by Frédéric Guérin; Douglas W. Stephan

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
103 KB
Volume
39
Category
Article
ISSN
0044-8249

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✦ Synopsis

C, 19 F, 11 B, and 31 P NMR spectroscopic data confirmed the presence of the B and Ti moieties. The observation of a distinct 31 P chemical shift indicated that this new product 3 was not the 1:1 zwitterionic species 2. Moreover, the presence of a single, temperature-invariant, Ti ± methyl environment suggested the formation of a bis-B(C 6 F 5 ) 3 adduct.

Crystals of 3 ´2 CH 2 Cl 2 were isolated from CH 2 Cl 2 . A crystallographic study [21] confirmed that [(tBu 3 PN) 2 Ti{m-MeB(C 6 F 5 ) 3 } 2 ] (3), an unprecedented di-zwitterionic species, sits on a position with crystallographically imposed twofold symmetry (Figure 1). The pseudo-tetrahedral coordination sphere about Ti comprises the nitrogen atoms of the

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