α-Haloenolates; VII1. Diethyl 1-Chloro-1-ethoxycarbonyl-1-lithiomethanephosphonate; A Convenient One-Step Preparation of α-Chloro-α,β-unsaturated Esters from Diethyl Trichloromethanephosphonate - VILLIERAS, Jean; PERRIOT, Pierre; NORMANT, Jean F (Synthesis, 1978)