| abstract |
Method of making complexing agentsnring ethers of the formula I,nwherein R, η, X, Y and Z are definednmeaning that the isocyanate isnof formula II in whichnY and n are as defined above,nis reacted with a compound of the general formulanof formula III wherein R, X and Z are as defined abovendefined meaning, in the environmentnan organic aprotic solvent atnat a temperature in the range of 0 to 50 ° C at molarnthe ratio of compounds of formulas II and IIIn2: 1, optionally in the presence of 0.1 to 0.5nmole% tertiary amine, preferablyntriethylamine as a catalyst,nfollowed by the product of general formulanI isolates. |