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In equilibrium


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Organometallic reagents are essential tools in synthetic chemistry. They work even better and more effectively in combination with alkali alkoxides. The exact nature of this effect has never been well understood. A team based in Switzerland has now performed a detailed study of the mechanism of reaction of aryl bromides with organo-magnesium reagents and lithium alkoxides. As reported in the journal
Angewandte Chemie, a complex equilibrium of bimetallic intermediates plays a key role.
Substituted aromatic ring systems are an important class of building block for the synthesis of many products, including pharmaceuticals, agrochemicals, and natural substances. However, the required functional side groups cannot generally be hooked onto the ring systems in a simple way. A widely employed method uses a detour through a halogen/metal exchange. First, a halogen atom, such as bromine, is attached to the desired position on the ring system. With the use of special or ....

Eva Hevia , Angewandte Chemie , University Of Bern Switzerland , Chemistry Physics Materials Sciences , ஈவா ஹெவியா , பல்கலைக்கழகம் ஆஃப் பெர்ன் சுவிட்சர்லாந்து , வேதியியல் இயற்பியல் பொருட்கள் அறிவியல் ,

Bucknell Astronomers Discover Binary Planetary System


Bucknell Astronomers Discover Binary Planetary System
January 21, 2021
by Mike Ferlazzo
An artist s composition of the two brown dwarfs Oph 98B in purple in the foreground and Oph 98A in red in the background. Rendering by Thibaut Roger
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Using NASA s Hubble Space Telescope, Bucknell physics & astronomy Professor Katelyn Allers and postdoctoral researcher Blake Pantoja have observed an astronomical anomaly few have encountered before. They were part of an international research team that has discovered a new binary planetary system 450 light-years away from Earth composed of two brown dwarfs of differing masses orbiting around each other from a strikingly wide distance. ....

United States , Katelyn Allers , Blake Pantoja , University Of Bern Switzerland , Space Telescope , Professor Katelyn Allers , Astrophysical Journal Letters , Hubble Space Telescope , Gemini Observatory , ஒன்றுபட்டது மாநிலங்களில் , பிளேக் பாந்டோஜா , பல்கலைக்கழகம் ஆஃப் பெர்ன் சுவிட்சர்லாந்து , இடம் தொலைநோக்கி , வானியற்பியல் இதழ் எழுத்துக்கள் , ஹப்பிள் இடம் தொலைநோக்கி , ஜெமிநை கண்காணிப்பு ,