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21344467567
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note
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Due to the poor solubility of ammonium acetate in benzene or toluene, sublimation of ammonium acetate occurred and thus made the azetropic removal of water inconvenient and inefficient.
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21344468251
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note
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4 (2 mmol) in refluxing absolute ethanol (5 mL), 87% yield was obtained with prolonged reaction times (14 hours). In this case, tetraethyl orthosilicate mainly served as a Lewis acid.
-
-
-
-
53
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21344456620
-
-
note
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+, 33%), 306.0 (16), 290.0 (31), 262.0 (10), 208.1 (36), 194.2 (100), 180.1 (21), 166.1 (24), 162.1 (19), 148.1 (42), 134.0 (72), 120.1 (45), 106.1 (15), 91.0 (8).
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