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Modern Art Ions: Several reports of research, which were published during the year, described continuing progress in the preparation of stable car-bonium ions, with the controversy over the existence of nonclassical carbonium ions still largely unresolved. Carbonium ions are organic ions with a positively charged carbon atom. In one of the most interesting of these papers, G. A. Olah and co-workers used fluosulfonic acid and antimony pentafluoride in liquid sulfur dioxide as a strongly acid medium.Using this reagent, they formed stable carbonium ions from alcohols and carbonyl compounds; the fluosulfonic acid also formed carbonium ions from saturated hydrocarbons and ion derivatives (9) from esters. Treatment of various halogenated compounds with a similar reagent produced bridged halonium (organic ion with positively charged halogen) ions (10), acyloxonium (positively charged carboxyl group) ions (11), and arylonium (positively charged phenyl group) ions (12). An unsubstituted cyclopropenium salt was isolated by R. Breslow, J. T. Groves, and G. Ryan, starting with a related halogen com pound. Such compounds are based on cyclo propene:
modern art ions Classifications. modern art ions classifications af governments tend to be based more on the imount of control exercised by the state, from /irtually total control—totalitarianism—through /arious forms of limited authority. Totalitarianism. In totalitarian systems, the government, as an agency of the state, seeks to control all activities of individual citizens. Fas-:ist Italy, Nazi Germany, and the Stalinist period )f the U.S.S.R. were examples of totalitarian itates in modern art ions times. The closest approxima-ions to pure totalitarianism in the world since he end of World War II would be Communist >hina, the Soviet Union, and some of their satel-ites. |
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