The synthesis of 2,7-tetramethylene-4,5-bis-benzotropylium perchlorate, an interesting example of a compound containing two positive charges within the same molecule, has been accomplished.
R. E. Harmon, R. Suder and S. K. Gupta, J. Chem. Soc. D, 1969, 1170 DOI: 10.1039/C29690001170
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