Tetrakis(4 - oxo - 3,5 - di - t - butylcyclohexa-2,5-dienylidene)cyclobutane (2) has been synthesized by thermal dimerization of bis-(4-oxo-3,5-di-t-butylcyclohexa-2,5-dienylidene(ethylene)(3) in refluxing toluene.
S. Koster and R. West, J. Chem. Soc. D, 1971, 1380 DOI: 10.1039/C29710001380
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