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Selective B–H versus N–H Bond Activation in Ammonia Borane by [Ir(dppm)2]OTf

✍ Scribed by Andrea Rossin; Maria Caporali; Luca Gonsalvi; Annalisa Guerri; Agustí Lledós; Maurizio Peruzzini; Fabrizio Zanobini

Book ID: 102165249
Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 278 KB
Volume: 2009
Category: Article
ISSN: 1434-1948
DOI: 10.1002/ejic.200900465

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✦ Synopsis

Abstract

Ammonia borane (AB, NH~3~·BH~3~) was activated selectively on the boron hydrogen atoms by [Ir(dppm)~2~]OTf, as shown by variable‐temperature ^31^P, ^11^B and ^1^H NMR studies, to yield cis‐ and trans‐[Ir(H)~2~(dppm)~2~]OTf dihydrides. X‐ray crystal structures of these complexes were obtained. DFT calculations suggest the key reaction intermediate to be a Lewis base (L) stabilised adduct, cis‐[Ir(H)(BH~2~·L)(dppm)~2~]^+^(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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