Abstract. &-Cyclopropylidene ketones show high reactivity towards 1, 4-addition reactions. c (-Cyclopropylidene aldehydes l_, aliphatic and aromatic d-cyclopropylidene ketones 2 and ti- -cyclopropylidene cycloalkanones 3, _ still unknown in 1977, are now easily available either by photooxygenation of enol ethers of cyclopropyl ketones, followed by PPh3 reduction(1)(1) or, better,- by Wittig reaction of cyclopropylidenetriphenylphosphorane with o (-keto- or o (- ...
[Stolle, Andreas; Ollivier, Jean; Piras, Pier Paolo; Salauen, Jacques; De Meijere, Armin Journal of the American Chemical Society, 1992 , vol. 114, # 11 p. 4051 - 4067]