Generated in methanol under controlled basicity, carbanions react with 2,5- or 2,6-dimethyl-1,4-benzoquinone to give cage tetraketones related to 1,4,7-[1]-ethyl[2′]ylidenenaphthalene or to benz[1,2-a; 3,4-g]-azulene.
F. M. Dean, L. E. Houghton, R. Nayyir-Mazhir and C. Thebtaranonth, J. Chem. Soc., Chem. Commun., 1979, 159 DOI: 10.1039/C39790000159
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