Bor-Cherng Hong, Zhong-Yi Chen and E. Sampath Kumar
J. Chem. Soc., Perkin Trans. 1, 1999, 1135-1138
DOI:
10.1039/A902038A,
Paper
In contrast to the [2 + 2] cycloaddition of fulvenes and ketenes, fulveneketene acetal, 2-cyclopentadienylidene-1,3-dioxolane, reacts with α-halo acyl halides to give various C-1 substituted fulvenes that constitute an important class of intermediates for organic synthesis.