The structure previously suggested for the indeno[2,1 -a]phenalenium cation, and later supported by M.O. calculations, is confirmed by proton magnetic resonance studies. The spectrum of 1,4,7-trimethylphenalenium perchlorate is recorded.
W. Bonthrone and D. H. Reid, J. Chem. Soc. B, 1966, 91 DOI: 10.1039/J29660000091
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