“…This Review is intended to (i) include in the proper context the original work ,, we have carried out with “APH” to synthesize vinyl cyclopropane carboxylic acids gem-dimethyl substituted on the vinyl group from 2,2-dimethylcyclohexanones bearing two leaving groups at the 3,4-position and from α,α-dimethyl cyclopentanones bearing a leaving group in the β-position and fused to a cyclopropane ring at α′,β′, and (ii) advertise and promote this unusual reagent discovered 61 years ago by Swan who disclosed in a single and unique paper its exceptional reactivity and Gassman who rediscovered it and promote it. ,,, It was also intended, in the context of EnCOrE project, to model the domain and to organize the data to extract the knowledge …”