The First Isolated Carbon Tetraradical with a Pair of Triplets

Article abstract of DOI:10.1021/ja00022a013

The synthesis of trans-perchlorovinylenebis(α,α,α?,α?- tetraphenyl-1,3-xylylene) (1), an exceptionally stable organic carbon tetraradical, which is isolated as a deep red solid, stable in air up to 200 °C, is reported. The electronic spectrum of 1 is pres