Unusual reactivity of the bis(pyrazolyl)borate chelate

B-H for B-X (X = F, Cl, OH) substitution in complexes of ruthenium

Michael J. Page, Barbara A. Messerle, Jörg Wagler

Research output: Contribution to journalArticle

15 Citations (Scopus)


Reaction of the complex [RuTp(Bp)PPh 3] (6, where Tp = tris(pyrazolyl)borate and Bp = bis(pyrazolyl)borate) with AgBF 4, AgOTf,and SOCl 2 was observed to yield the highly unusual B-F- and B-OH-containing compounds [RuTp(Bp F2)PPh 3] (7), [RuTp(Bp OH)PPh 3]OTf (9), and [RuTp-(Bp OH) PPh 3]Cl (10), respectively, via substitution of the Bp boron-hydride groups. The complexes 7 and 9 were structurally characterized by X-ray crystallography. Formation of the B-F product 7 represents a rare example of BF 4 anion reactivity under relatively mild conditions, whereas the B-OH product 9 contains the first example of a stable trivalent pyrazolyl-borane moiety. These substitution processes are thought to be assisted by the interaction of the boron-hydride moieties of 6 with the Lewis acidic Ag(I) and S(IV) centers of the reactive agents, which polarize the B-H bond and activate the boron center toward electrophilic attack of available halogen- and hydroxy-containing species.

Original languageEnglish
Pages (from-to)6145-6151
Number of pages7
Issue number21
Publication statusPublished - 9 Nov 2009
Externally publishedYes

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