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Bor bietet Überraschendes:Eigentlich sollte man erwarten, dass das Dimesitylborinium‐Ion („Pferd“), das elektronenärmste isolierbare zweifach koordinierte Bor‐Kation, bei einer chemischen Reaktion in ein Produkt mit einer höheren Koordinationszahl am Bor‐Zentrum überführt wird. Stattdessen reagiert es mit zwei Äquivalenten Diphenylacetylen über eine zweifache 1,2‐Carboborierung zu einem weiteren isolierbaren...
Borinium ions, that is, two‐coordinate boron cations, are the most electron‐deficient isolable boron compounds. As borinium ions have only four formal valence electrons on boron, they should show a strong tendency to accept electron pairs on the boron atom to fill its valence shell. Thus chemical reactions of borinium ions are expected to give products in which the coordination number of boron is...
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