Dong, Zhaowen’s team published research in Chemistry – A European Journal in 2019 | 576-83-0

Chemistry – A European Journal published new progress about Aromaticity. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Application In Synthesis of 576-83-0.

Dong, Zhaowen; Schmidtmann, Marc; Mueller, Thomas published the artcile< Potassium Salts of 2,5-Bis(trimethylsilyl)-Germolide: Switching between Aromatic and Non-Aromatic States>, Application In Synthesis of 576-83-0, the main research area is potassium salt trimethylsilyl germolide preparation crystal mol structure reactivity; switching aromatic non aromatic state mesityl silyl germolole; X-ray diffraction; aromaticity; density functional calculations; germacyclopentadienyl anion; germanium.

The reduction of a 1-mesityl-2,5-bis-trimethylsilylchlorogermole 8 with KC8 is reported. While the reaction with one equivalent of KC8 gave the dimer with a Ge-Ge bond 10, excess of KC8 (four equivalent) resulted in the formation of the potassium salt of the germole dianion, 11 with reductive cleavage of the Ge-C bond. Careful reduction with two equivalent of KC8 in THF provided the potassium salt of the planar germolide 5. Its solid-state structure revealed contact ion pairs with the potassium ion η5-coordinated to the germacyclopentadienide ring. The mol. structure of the anion indicates a high degree of cyclic electron delocalization, in agreement with results from DFT calculations Separation of the ion pair by complexation of the potassium ions with 18-crown-6 triggers the isomerization to germolide 6, which is characterized by a pyramidal coordination sphere of the germanium atom and a localized diene structure. The isomers 5 and 6 represent a rare example for a structurally manifested switch between a non-aromatic and an aromatic state induced by an external stimulus, in this case the complexation of the counter cation.

Chemistry – A European Journal published new progress about Aromaticity. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Application In Synthesis of 576-83-0.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary