METHOD TO SEPARATE THE ISOMERS OF A CROWN COMPOUND AND MAKING IT POSSIBLE TO RECOVER IN PARTICULAR THE PURE CIS-SYN-CIS ISOMER FROM DICYCLOHEXYL 18 - CROWN 6 - DCH18C6

摘要

The invention concerns a method for separating the isomers of a crown compound and making it possible to recover in particular the pure cis-syn-cis isomer from DCH 18C6. This method includes the following stages : a) dissolving in an organic solvent a mixture of the isomers of said crown compound including the cisanti-cis isomer and the cis-syn-cis isomer, b) adding uranyl nitrate to the solution obtained in stage a) is sufficient quantities so that virtually all the isomers, except the cis-syn cis isomer, are precipitated in the form of complexes with the uranyl nitrate, c) separating the formed precipitate, and d) recovering the pure cis-syn-cis isomer from the solution, and e) recovering the pure cis-anti-cis isomer from the precipitate. Fig. 1 B 10143 MDT