A novel complex of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6) and dimethylcarbonate or dimethyloxalate, containing one molecule of dimethylcarbonate or dimethyloxalate for each molecule of 18-crown-6, is useful in isolating 18-crown-6 from mixtures containing it. In the isolation or purification process described, 18-crown-6 is isolated from a mixture containing it by reacting the 18-crown-6 with dimethylcarbonate or dimethyloxalate to form a complex substantially in the form of a dispersed solid in a solution containing the non-complexed material of the mixture, separating the dispersed complex from the solution and disassociating the dimethylcarbonate or dimethyloxalate from the separated complex.
展开▼
