Organic 2 Review Problem 72

Organic 2 Review Problem 72 - as alcohols. (3) Conversion...

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56 PRACTICAL ORGANIC CHEMISTRY be regarded as very strong insoluble bases (or salts of such bases) of extremely high molecular weight. Such polymers are designated as strong base anion resins. There is also a class of weak base anion resins which contain amino groups in place of the quaternary ammonium groups. -CH H- CH 2 -N(CHj) 3 Cl CH 2 N(CHj) 3 Cl CH CH 2 CH- CH 2 N(CHj) 3 Cl FIG. 28. Ion exchange resins are, in general, not suitable for macro-work owing to the limited number of "exchange" groups. Among the more important appli- cations of ion exchangers are: (1) Conversion of a sodium salt of a carboxylic acid into the free acid: e.g., if R-SO,H represents the cation exchange resin: R-SO 3 H-KCH 8 COONa -»• R-SO 3 Na-HCH 8 COOH (2) Removal of bases from mixtures of bases and neutral compounds such
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Unformatted text preview: as alcohols. (3) Conversion of the salt of a weak base into the free base: e.g., if + [R'N(CH 3 ) 8 OH] represents the cation exchange resin: + _ + _ +- -i- [R-N(CHa) 8 OH] + C 6 H 5 NH 3 Cl-^ [R-N(CHJ 1 Cl] + C 6 H 5 NH 8 OH I C 6 H 5 NH 1 + H 1 O (4) Removal of acids from mixtures of acids and neutral compounds. Conversion of sodium citrate into citric acid. This conversion cannot easily be carried out on a semi-micro scale by ordinary chemical means. Liberation of an acid from one of its salts by dil. H 1 SO 4 is feasible when the organic acid is insoluble in water (e.g. an aromatic acid) or...
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