The behavlor of other crown ether-synergized sulfonic acid extractkn systems suggested that the title system woukl be selective for cesium. Synthesis of the new lipophilic crown ether, bk[4(5)-t~lbenzo).2l-crown-7 (D(tBB)21C7), alkwedtertlngofthkhypotheela Undernonbadlngconditknr, the dktrlbutlon codfklent for wdum between a toluene rolutbn 0.025 M in didodtwyhaphtha~wllonlc acid (HDD-NS) and D(tBB)21C7 and an aqueous phase 0.1 M in nitrk ackl k 100 with separation factors of 1.2 from rubidium, 5.6 from potasdun, and 294 from sodium. Under loading and competitive extractlon conditlonr, the dktrlbutkn coefficlentr were lower (5 for cesium), but the separation factors remained in the same order and of useful magnitude, 1.5 from rubkllum, 6.4 from potarrlum, and 192 from rodlum. Increasing ihe concmtraknrofD(t68)2lC7andHDDNSintheorgalcp~ gives hlgher distribution coefficients for cedum as did lower aqueous acid concentrattlons.
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