Corrigendum to: Spectroscopic Observation of the Triplet Diradical State of a Cyclobutadiene (Angewandte Chemie International Edition, (2017), 56, 34, (10183-10187), 10.1002/anie.201705228)

In this Communication, the statement on page 10183, right column, “In one case, that of tetrakis(t-butyl)cyclobutadiene, crystallographic X-ray data measured at room temperature suggested a square geometry, and the authors argued that it has a triplet ground state.^[8]”, is wrong and should be replaced by: “In one case, the possibility of a diradical reactivity was suggested, but no EPR studies supporting a triplet state were reported.^[8]” The following sentence, “However, no spectroscopic support for this claim (e.g. EPR) was presented and the observed chemistry of this compound did not grant a conclusive evidence for the triplet state”, should be removed.