Reversible [4 + 2] cycloaddition reaction of 1,3,2,5-diazadiborinine with ethyleneElectronic supplementary information (ESI) available: Experimental and calculation details, and crystallographic information for 2, 4a, 4b, 4d, and 6. CCDC 1418724-1418728. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc03174e
Under ambient conditions, a [4 + 2] cycloaddition reaction of 1,3,2,5-diazadiborinine 1 with ethylene afforded a bicyclo[2.2.2] derivative 2 , which was structurally characterized. The cyclization process was found to be reversible, and thus retro-[4 + 2] cycloaddition reproduced 1 quantitatively, c...
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