Importance

Loading Importance Indicators...

Abstract

A process is disclosed for the non-chromatographic purification of chromogenic cryptahemispherands of the following general formula (II) which are capable of selective binding of sodium ion in aqueous solution: ##STR1## wherein: R, same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl, aryl or benzyl; R', same or different, is lower alkyl, lower alkylidene, lower alkenyl, allyl, aryl or benzyl; R', same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl, aryl or benzyl; Z is halogen; Y is electron withdrawing group, e.g. CN, NO.sub.2, CF.sub.3, COOR; m is 1 to 3; n is 1 to 3; a is 1 to 3; b is 1 to 3; k is 1 to 2; l is 1 to 2; k and l are not both 2; and x is 2 to 4. The compound of formula (II) is isolated from the reaction mixture by consecutive treatment of the crude reaction product with suitable solents in order to separate unreacted organic components, inorganic material, and polymers and provide a sodium-free final product.

Loading the Abstract Image...

First Claim