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Title: Turning Boron Chemistry on its Head: The unusual chemistry of boron in low oxidation states
Due to its inherent electron deficiency, boron prefers non-classical bonding regimes when combined to molecules with itself - in other words, boron forms polyhedral boranes, made up of multicenter bonds, rather than chains or rings with electron-precise boron-boron bonds. In the case of the latter, only very few well-defined examples have been published over the past decades, which all suffer from low-yielding, non-selective syntheses that solely rely on reductive coupling of amino(halo)boranes. Consequently, the area of classical boron-boron multiple bonds is relatively undeveloped. Over the past four years we have put significant effort into the development of new synthetic strategies to overcome this seemingly element-specific deficiency. Here, some new results on the formation of B-B-double and –triple bonds will be presented together with some unusual results from reactivity studies of the latter.
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