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An unusual [4 + 4] cycloadduct from an o-quinodimethane : characterisation and computational studies
(2017)
Trapping of a pyrimidinone-derived o-quinodimethane with tetraphenylcyclopentadienone gives a mixture of the [4 + 2] and formal [4 + 4] adducts. Computational studies show that the latter arises by a sequence of [4 + 2] ...