Boron replaces metal by forming complexes with olefins, reducing
They have shown that under certain conditions, boron can mimic the reaction behavior of metals without being toxic or as expensive as metals.
Here we present a monovalent boron system able to coordinate olefins and mediate their liberation and functionalization, based on stable and well-defined borylene–olefin π complexes. These molecules are shown to be distinct from their conventional covalently bound form—boriranes—instead better resembling borylenes with π-bound olefins.
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The 1 H and 13 C NMR resonances of the borirane unit (1 H: 2.21–1.91 ppm; 13 C: 52.8–42.3 ppm) are downfield of those of 7a and 7b, indicating a comparatively more loosely bound olefin unit.
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