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Alkali metal salts M2[1] (M=Li, Na) of doubly reduced 9,10‐dimethyl‐9,10‐dihydro‐9,10‐diboraanthracene (1) instantaneously add the C=O bond of CO2 across their boron centers to furnish formal [4+2]‐cycloadducts M2[2]. If only 1 equiv of CO2 is supplied, these products are stable. In the presence of excess CO2, however, C−O bond cleavage occurs and an O2− equivalent is transferred to CO2 to furnish...
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