Chemists have long been interested in synthesizing compounds that push the boundaries of conventional molecular structure. Incorporating metal centres into the ring unit of highly strained and unsaturated cyclic molecules can help reduce strain — a tactic that has now been used to render a previously inaccessible metallapentalyne isolable.
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Beweries, T., Rosenthal, U. Breaking the rules. Nature Chem 5, 649–650 (2013). https://doi.org/10.1038/nchem.1702
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DOI: https://doi.org/10.1038/nchem.1702
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