C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/237.2
C07D 498/08 (2006.01)
Patent
CA 2037281
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: Image (II) 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, NO2, CF3, 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; 1 is 1 to 2; k and 1 are not both 2; and x is 2 to 4, The compound of formula (II) is isolated from the reaction mix- ture by consecutive treatment of the crude reaction product with suitable solvents in order to separate unreacted organic components, inorganic material, and polymers and provide a sodium-free final product. 0559S
Czech Bronislaw P.
Macrae & Co.
Technicon Instruments Corporation
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