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Консультация № 197008
08.11.2019, 18:03
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
К смеси изомерных бутенов-2 и бензола добавили бромной воды до появления слабой окраски и после отмывки избытка брома раствором щелочи смесь высушили и перегнали. Какое вещество было получено в приемнике?
К смеси изомерных бутенов-2 и бензола добавили бромной воды до появления слабой окраски и после отмывки избытка брома раствором щелочи смесь высушили и перегнали. Какое вещество было получено в приемнике?
Обсуждение
12.11.2019, 20:12
общий
это ответ
Здравствуйте, kholostova!
Бутен-2 присоединяет бром с образованием 2,3-дибромбутана
CH3-CH=CH-CH3 + Br2 = CH3-CHBr-CHBr-CH3
Отметим, что это вещество имеет 2 хиральных центра и при получении из смеси цис и транс-изомеров алкена будет представлено смесью 3 стереоизомеров
Бензол с бромной водой не реагирует, для его бромирования требуются более жёсткие условия.
Из содержащихся в полученной смеси веществ бензол перегоняется при температуре около 80[$176$]C и будет получен в приёмнике дистиллятора.
Про 2,3-дибромбутан известно, что он перегоняется при подобных температурах только при вакуумной дестилляции.
Бутен-2 присоединяет бром с образованием 2,3-дибромбутана
CH3-CH=CH-CH3 + Br2 = CH3-CHBr-CHBr-CH3
Отметим, что это вещество имеет 2 хиральных центра и при получении из смеси цис и транс-изомеров алкена будет представлено смесью 3 стереоизомеров
Бензол с бромной водой не реагирует, для его бромирования требуются более жёсткие условия.
Из содержащихся в полученной смеси веществ бензол перегоняется при температуре около 80[$176$]C и будет получен в приёмнике дистиллятора.
Про 2,3-дибромбутан известно, что он перегоняется при подобных температурах только при вакуумной дестилляции.
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