3 years ago

Iridium Halide Complexes [1,1-X2-8-SMe2-1,2,8-IrC2B9H10]2 (X = Cl, Br, I): Synthesis, Reactivity and Catalytic Activity

Iridium Halide Complexes [1,1-X2-8-SMe2-1,2,8-IrC2B9H10]2 (X = Cl, Br, I): Synthesis, Reactivity and Catalytic Activity
Mikhail M. Vinogradov, Olga Chusova, Vasilii A. Fastovskiy, Sergey V. Timofeev, Alexey P. Moskovets, Alexander P. Molotkov, Alexander A. Pavlov, Yulia V. Nelyubina, Denis A. Chusov, Dmitry A. Loginov
The reactions of thallium salt Tl[7-SMe2-7,8-C2B9H10] with [(cod)RhCl]2 and [Cp*RuCl]4 are accompanied by room-temperature polyhedral rearrangement, giving rhoda- and ruthenacarboranes 1-cod-8-SMe2-1,2,8-RhC2B9H10 (2) and 1-Cp*-8-SMe2-1,2,8-RuC2B9H10 (3), respectively. According to DFT calculations, the rearrangement could be attributed to the triangular face rotation mechanism. The reaction of iridium derivative 1-cod-8-SMe2-1,2,8-IrC2B9H10 (1) with anhydrous hydrohalic acids HX (X = Cl, Br, I) results in the dimeric halide iridacarboranes [1,1-X2-8-SMe2-1,2,8-IrC2B9H10]2 [4a–c; X = Cl (a), Br (b), I (c)]. Bromide 4b reacts with Tl[Tl(η-7,8-C2B9H11)] and TlCp giving iridacarboranes 8′-SMe2-1,1′-Ir(2,3-C2B9H11)(2′,8′-C2B9H10) (5) and 1-Cp-8-SMe-1,2,8-IrC2B9H10 (6). The formation of the latter compound is accompanied by demethylation of the SMe2 substituent. The structures of 2, 3, 5 and 6 were determined by single-crystal X-ray diffraction. Iridacarboranes 4b and [1,1-Br2-4-SMe2-1,2,3-IrC2B9H10]2 (7) catalyze the dimerization of diphenylacetylene, giving 1,2,3-triphenylnaphthalene in 20–24 % yields. Compounds 4b and 7 also effectively catalyze the reductive amination reaction between aldehydes (or ketones) and primary (or secondary) amines in the presence of carbon monoxide, giving the corresponding secondary and tertiary amines in high yields (60–85 %).Iridium halide complexes [1,1-X2-8-SMe2-1,2,8-IrC2B9H10]2 (X = Cl, Br, I) were synthesized by reaction of the cyclooctadiene derivative 1-cod-8-SMe2-1,2,8-IrC2B9H10 with anhydrous hydrohalic acids HX. These complexes have proven to be effective catalysts for the dimerization of alkynes and the reductive amination of aldehydes and ketones.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700498

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