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Isolation of a pentadienyl-type radical featuring a central secondary carbon - Nature Synthesis
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Stable tertiary R3C· carbon radicals have been known since Gomberg's pioneering discovery of the triphenylmethyl radical more than a century ago. In stark contrast, secondary R2CH· and primary RCH2· carbon radicals are elusive species only observed spectroscopically. Herein, we describe the isolation of a crystalline pentadienyl-type radical, featuring a central secondary carbon, prepared by single-electron reduction of a bis(imino)carbene conjugate acid.
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