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Issue 46, 2016
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A pentacoordinated norbornenyl-acyl-rhodium(III) complex as a likely intermediate in the catalytic hydroacylation of norbornadiene

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Abstract

[RhCl(NCO)(nbyl)(PR3)] (nbyl = σ-norbornenyl; NCO = quinoline-8-acyl; R = p-F-C6H4) (1) has been synthesized by the reaction of [Rh(nbd)Cl]2 (nbd = norbornadiene) with 2 equivalents of NCHO (quinoline-8-carbaldehyde) and 2 equivalents of PR3. Compound 1 has been fully characterized in solution and also in the solid state by X-ray diffraction. Compound 1 shows low stability in solution and undergoes slow ring closure isomerization to [RhCl(NCO)(ntyl)(PR3)] (ntyl = σ-nortricyclyl) (2) after 12 hours. Reaction of 1 with an extra equivalent of aldehyde (NCHO) and PR3 led to the formation of [RhCl(H)(NCO)(PR3)2] (3) and an equivalent of ketone, which is a hydroacylation product. The catalytic activity of 3 in the hydroacylation of nbd with NCHO is reported as well as the catalytic activity of compound 1. Compounds 1 and 3 are proposed as intermediate species in the catalytic hydroacylation of norbornadiene with NCHO.

Graphical abstract: A pentacoordinated norbornenyl-acyl-rhodium(iii) complex as a likely intermediate in the catalytic hydroacylation of norbornadiene

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Publication details

The article was received on 28 Sep 2016, accepted on 17 Oct 2016 and first published on 18 Oct 2016


Article type: Paper
DOI: 10.1039/C6DT03778J
Citation: Dalton Trans., 2016,45, 18502-18509
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    A pentacoordinated norbornenyl-acyl-rhodium(III) complex as a likely intermediate in the catalytic hydroacylation of norbornadiene

    N. Almenara, L. Ibarlucea, C. Mendicute-Fierro, J. M. Seco, A. Rodríguez-Diéguez, M. A. Garralda and M. A. Huertos, Dalton Trans., 2016, 45, 18502
    DOI: 10.1039/C6DT03778J

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