Article Synopsis
- A new method is presented for efficiently creating cage B-centered carboranyl radicals at specific boron sites (B3, B4, B9) using visible light and palladium catalysts from common starting materials.
- The reactivity of these radicals decreases in the order of B3 being the most reactive, followed by B4 and then B9.
- These radicals serve as useful intermediates for producing a range of cage B-(hetero)arylated carboranes at room temperature.
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Article Abstract
This work describes a general method for the efficient production of a class of cage B-centered carboranyl radicals at the B3, B4, and B9 sites via a visible-light-promoted palladium(0)/palladium(I) pathway using readily available iodo--carboranes as the starting materials. The electrophilicities of these hypervalent boron-centered radicals decrease in the following order: B3 > B4 > B9. They are useful intermediates for the preparation of a family of cage B-(hetero)arylated -carboranes at ambient temperature.
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