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Issue 18, 2014
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Versatile reactivity of a rhodium(i) boryl complex towards ketones and imines

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Abstract

The rhodium(I) boryl complex [Rh(Bpin)(PEt3)3] (1) reacts with the ketones α,α,α-trifluoroacetophenone and 9-fluorenone by insertion of the C[double bond, length as m-dash]O bond to give [Rh{η3-C(CF3)(OBpin)C6H5}(PEt3)2] (4) and [Rh{η5-C13H8(OBpin)}(PEt3)2] (6), whereas the reaction with acetophenone leads to the formation of [Rh(H)(PEt3)3] (2), [Rh(OBpin)(PEt3)3] (3) and (E)-(Ph)CH[double bond, length as m-dash]CHBpin. Treatment of 1 with ketimines generates [Rh{η3-C6H5[double bond, length as m-dash]C(Ph)N(Ph)(Bpin)}(PEt3)2] (7), [Rh{(η3-C12H8)N(Ph)(Bpin)}(PEt3)2] (8) or [Rh{CPh2N(H)(Bpin)}(PEt3)2] (9). The insertion of aldimines into the Rh–B bond gives access to [Rh[η3-CH{N(C6H13)Bpin}C6H5](PEt3)2] (11) or [Rh[η3-CH{N(Ph)Bpin}C6H5](PEt3)2] (12). The latter is converted into the C–H activation product [Rh{(C6H4)-o-N(Bpin)(CH2Ph)}(PEt3)3] (13). Complex 13 reacts with B2pin2 to yield the boryl complex 1 and the amine PhCH2N(Bpin)(C6H4-o-Bpin).

Graphical abstract: Versatile reactivity of a rhodium(i) boryl complex towards ketones and imines

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Supplementary files

Article information


Submitted
09 Jan 2014
Accepted
17 Feb 2014
First published
20 Mar 2014

Dalton Trans., 2014,43, 6786-6801
Article type
Paper

Versatile reactivity of a rhodium(I) boryl complex towards ketones and imines

S. I. Kalläne, T. Braun, B. Braun and S. Mebs, Dalton Trans., 2014, 43, 6786
DOI: 10.1039/C4DT00080C

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