Dg. Gilheany et al., THE RICH CHEMISTRY OF FULVALENE YLIDES - A DICHOTOMY IN PHOSPHONIUM SALT YLIDE HYDROLYSIS AND THE DEVELOPMENT OF A NEW SYNTHESIS OF AZULENES, Phosphorus, sulfur and silicon and the related elements, 75(1-4), 1993, pp. 11-14
A series of fulvalene ylides was synthesised. Only weak aromatic effec
ts were found across the ylide bond. Their chemistry includes the firs
t example of a dichotomy in phosphonium salt/ylide hydrolysis, interes
ting dynamic nmrs of the adducts with dimethyl acetylenedicarboxylate
and a new synthesis of azulenes.