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Issue 5, 2015
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Reactions of osmapyridinium with terminal alkynes

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We have synthesized a new type of ten-membered osmacycles by reaction of osmapyridinium with HC[triple bond, length as m-dash]CCH(OH)R (R = Ph, Et). We propose that these reactions take place initially by coordination of the alkynes, [2 + 2] cycloaddition, subsequent 1,2-hydrogen migration and a final reductive elimination. The reactions with phenylacetylenes do not afford the corresponding derivatives but rather give η4-coordinated cyclopentadiene complexes, which are proposed to derive from a [4 + 2] cycloaddition process. Related reactions of the η4-coordinated cyclopentadiene complexes are also discussed.

Graphical abstract: Reactions of osmapyridinium with terminal alkynes

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The article was received on 12 Feb 2015, accepted on 25 Mar 2015 and first published on 26 Mar 2015

Article type: Research Article
DOI: 10.1039/C5QO00052A
Org. Chem. Front., 2015,2, 560-568

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    Reactions of osmapyridinium with terminal alkynes

    Y. Wei, X. Zhou, G. Hong, Z. Chen, H. Zhang and H. Xia, Org. Chem. Front., 2015, 2, 560
    DOI: 10.1039/C5QO00052A

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