Process for preparing oligophosphonic acids or oligophosphinic acids, their salts and/or esters, as well as phosphonic acid derivatives

摘要

Oligophosphonic acids or oligophosphinic acids, their salts and / or their esters are produced by a new process in which olefin polyhalides of the general formula IMAGE in which R1 and R2 are the same or different and are hydrogen, halogen or a hydrocarbon with the exchange of the other Double bond permanent halogen and with simultaneous saturation of the double bond with alkali metal salts of diesters of phosphorous acid or with alkali metal salts of esters of alkyl or arylphosphonic acids. The reaction takes place in the presence of solvents, e.g. Tetrahydrofuran. If desired, the reaction products formed are saponified to the free polyphosphonic or phosphinic acids or their salts. The invention further relates to the new oligophosphonic acids or oligophosphinic acids obtainable by this process, their salts and / or esters, in particular 1,1,2,2-ethane-tetrakisphosphonic acid.