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The fulvalenes are the class of hydrocarbons obtained by formally cross‐conjugating two rings through a common exocyclic double bond. Although the first report of such a compound dates to 1915, study of the series began in earnest only in the 1950s, and even today many of the unsubstituted parent hydrocarbons remain unknown. The following report, the first to specifically address this class of molecules, summarises the information available from research published to the end of 2004 and offers some suggestions for future study. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

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1 //-Cyclopropa[b]naphthalene (12) and 1 //-cyclopropabenzene (2) are converted for the first time into the 1-alkylidene-1 //-cycloproparenes 17-22 and 27-30, respectively, via cycloproparenyl anion generation and subsequent Peterson olefination. To date the reaction sequence fails to provide parent hydrocarbons 5 and 6. The structure of (diphenylmethylene)cyclopropabenzene 27 has been established by X-ray crystallographic methods [crystal data for C20H14: space group C5a-Cl-Cla-C2 -146.6 C13-C6-C7-C12 -36.7 C6-Cl-Cla-C5a 176.1

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