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Issue 39, 2017
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Photochemical generation and trapping of 3-oxacyclohexyne

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The strained heterocyclic alkyne, 3-oxacyclohexyne, was generated photochemically for the first time using a cyclopropanated phenanthrene precursor, and trapped by cyclopentadienones as Diels–Alder adducts. The precursor initially produced the putative 3-oxacyclopentylidenecarbene that subsequently rearranged to the cycloalkyne. Computational studies indicate that the carbene favors a singlet state, and the barrier for its ring expansion by a 1,2-shift of the carbon proximal to oxygen is lower in energy than the corresponding shift of the distal carbon.

Graphical abstract: Photochemical generation and trapping of 3-oxacyclohexyne

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The article was received on 11 Jul 2017, accepted on 15 Sep 2017 and first published on 15 Sep 2017

Article type: Communication
DOI: 10.1039/C7OB01697B
Citation: Org. Biomol. Chem., 2017,15, 8270-8275
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    Photochemical generation and trapping of 3-oxacyclohexyne

    R. Fan, Y. Wen and D. M. Thamattoor, Org. Biomol. Chem., 2017, 15, 8270
    DOI: 10.1039/C7OB01697B

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