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ACYLATION REACTIONS CATALYSED BY STRONG ACIDS .1. EVIDENCE FOR THE EXISTENCE OF ACETYLIUM (THE ACETYL CATION), (CH3.CO)+, IN SOLUTIONS OF CONCENTRATED AQUEOUS PERCHLORIC ACID IN ACETIC ANHYDRIDE
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JOURNAL OF THE CHEMICAL SOCIETY,
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FEIGL F, 1947, SPOT TESTS, P397