Abstract
Packing constraints and precise placement of functional groups are the reason that organic molecules in the crystalline state often display unusual physical or chemical properties not observed in solution. Here we report a single-crystal-to-single-crystal dimerization of a bromodiacetylene that involves unusually large atom displacements as well as the cleavage and formation of several bonds. Density functional theory computations support a mechanism in which the dimerization is initiated by a [2 + 1] photocycloaddition favoured by the nature of carbon–carbon short contacts in the crystal structure. The reaction proceeded up to the theoretical degree of conversion without loss of crystallinity, and it was also performed on a preparative scale with good yield. Moreover, it represents the first synthetic pathway to (E)-1,2-dibromo-1,2-diethynylethenes, which could serve as synthetic intermediates for the preparation of molecular carbon scaffolds. Our findings both extend the scope of single-crystal-to-single-crystal reactions and highlight their potential as a synthetic tool for complex transformations.
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Acknowledgements
Funding from the European Research Council (ERC Grant 239831, ‘OrgElNanoCarbMater’), the Swiss National Science Foundation (SNF Grant 200020-121812) and ETH Zürich (ETH Research Grant ETH-05 08-2) is acknowledged. T.K.T. acknowledges financial support from the Marie Heim-Voegtlin grant PMPDP2_134151/1. C.C. thanks the Sandoz Family Foundation and the Swiss National Science Foundation (Grants 200021-121577 and 200021-137529).
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T.N.H. and S.S. synthesized, characterized and crystallized the monomers, conducted the dimerization experiments, characterized the products and contributed to the preparation of the manuscript. R.M. assisted in the synthesis. T.K.T. performed the DFT computations designed and directed by C.C.; both these authors contributed to the preparation of the manuscript. A.S. performed the ESR measurements. R.S. and W.B.S. performed the X-ray crystal structure analyses. H.F. designed and directed the research and wrote the manuscript.
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Crystallographic data for compound 1. (CIF 20 kb)
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Crystallographic data for compound 3. (CIF 20 kb)
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Crystallographic data for a second polymorph of compound 1. (CIF 17 kb)
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Hoheisel, T., Schrettl, S., Marty, R. et al. A multistep single-crystal-to-single-crystal bromodiacetylene dimerization. Nature Chem 5, 327–334 (2013). https://doi.org/10.1038/nchem.1575
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DOI: https://doi.org/10.1038/nchem.1575
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