The Effect of Solvent on Spectra. IV. Pyridinium Cyclopentadienylide

Edward M. Kosower, Brian G. Ramsey

Research output: Contribution to journalArticlepeer-review


The preparation of the ylide, pyridinium cyclopentadienylide, according to the synthesis of Lloyd and Sneezum, is reported. The behavior of the visible absorption band in solvents of different Z-value (empirical polarity measure) corresponds to that of an intramolecular charge-transfer transition and this conclusion is supported by comparison with the spectra of 4-carbamidopyridinium cyclopentadienylide. Photolysis of pyridinium cyclopentadienylide in n-heptane produces pyridine and a very unstable species, possibly the unknown hydrocarbon, fulvalene.

Original languageEnglish
Pages (from-to)856-860
Number of pages5
JournalJournal of the American Chemical Society
Issue number4
StatePublished - 1959
Externally publishedYes


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