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
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
Some people used the platform to organize ahead of the storming of the U.S. Capitol in January 2021, and last month Senator Mark Warner sent a letter to Durov urging him to curb Russian information operations on Telegram. "And that set off kind of a battle royale for control of the platform that Durov eventually lost," said Nathalie Maréchal of the Washington advocacy group Ranking Digital Rights. So, uh, whenever I hear about Telegram, it’s always in relation to something bad. What gives? On February 27th, Durov posted that Channels were becoming a source of unverified information and that the company lacks the ability to check on their veracity. He urged users to be mistrustful of the things shared on Channels, and initially threatened to block the feature in the countries involved for the length of the war, saying that he didn’t want Telegram to be used to aggravate conflict or incite ethnic hatred. He did, however, walk back this plan when it became clear that they had also become a vital communications tool for Ukrainian officials and citizens to help coordinate their resistance and evacuations. The last couple days have exemplified that uncertainty. On Thursday, news emerged that talks in Turkey between the Russia and Ukraine yielded no positive result. But on Friday, Reuters reported that Russian President Vladimir Putin said there had been some “positive shifts” in talks between the two sides.
from ru
