The EPR identification of bis(2,4,6-tri-tert-butylphenyl)-1,3-diphosphaallyl radical

The paramagnetic species detected by EPR spectroscopy upon electrochemical reduction of bis(2,4,7-tri-tert-butyl-phenyl)-1,3-diphosphaallene in THF solution has been unambiguously identified as the title radical, the identification being supported by DFT calculations.