Kekulé diradicaloids derived from a classical N-heterocyclic carbene
Two-electron reduction of bis(1,3-imidazolinium) salts 2 and 3 with KC8 gives rise to stable diradicaloids 4 and 5, respectively. Calculations reveal a very low singlet–triplet energy gap ΔES–T for 5 (10.7 kcal mol−1), while ΔES–T for 4 (29.1 kcal mol−1) is rather large.
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