Sulfonation of 4′-acetyl-, 4′-(tert-butyl)-dibenzo-18-crown-6 and (dibenzo-18-crown-6)-4′-sulfonic acid with potassium sulfate in polyphosphoric acid
A. D. GrebenyukM. Ulugbek National University of Uzbekistan, Tashkent, 700174, UzbekistanА. К. ТашмухамедоваM. Ulugbek National University of Uzbekistan, Tashkent, 700174, Uzbekistan
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