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Получать трехчленные углеродные циклы можно с помощью карбенов. Но не любых, а либо акцепторных, либо нейтральных. Так считали химики до недавней работы американских ученых, которые показали, что в присуствии железного катализатора любые карбены вступают в реакцию циклопропанирования. Причем не только в органических растворителях, но и в воде

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Получать трехчленные углеродные циклы можно с помощью карбенов. Но не любых, а либо акцепторных, либо нейтральных. Так считали химики до недавней работы американских ученых, которые показали, что в присуствии железного катализатора любые карбены вступают в реакцию циклопропанирования. Причем не только в органических растворителях, но и в воде

#Химия | *6.5

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As a result, the pandemic saw many newcomers to Telegram, including prominent anti-vaccine activists who used the app's hands-off approach to share false information on shots, a study from the Institute for Strategic Dialogue shows. Oleksandra Matviichuk, a Kyiv-based lawyer and head of the Center for Civil Liberties, called Durov’s position "very weak," and urged concrete improvements. Unlike Silicon Valley giants such as Facebook and Twitter, which run very public anti-disinformation programs, Brooking said: "Telegram is famously lax or absent in its content moderation policy." Pavel Durov, Telegram's CEO, is known as "the Russian Mark Zuckerberg," for co-founding VKontakte, which is Russian for "in touch," a Facebook imitator that became the country's most popular social networking site. He said that since his platform does not have the capacity to check all channels, it may restrict some in Russia and Ukraine "for the duration of the conflict," but then reversed course hours later after many users complained that Telegram was an important source of information.
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