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Unlike aromatic compounds, which follow Hückel's rule ([4n+2] π electrons) [1] and are highly stable, antiaromatic compounds are highly unstable and highly reactive. To avoid the instability of antiaromaticity, molecules may change shape, becoming non-planar and therefore breaking some of the π interactions.
It is antiaromatic, because it has 4n π electrons where n is any integer. For this reason it dimerizes even at temperatures as low as −100 °C. [3] [4] The derivative 1,3,5-tri-tert-butylpentalene was synthesized in 1973. [5] Because of the tert-butyl substituents this compound is thermally stable.
Early studies demonstrated that COT did not display the chemistry of an aromatic compound. [7] Then, early electron diffraction experiments concluded that the C-C bond distances were identical. [ 8 ] However, X-ray diffraction data from H. S. Kaufman demonstrated cyclooctatetraene to adopt several conformations and to contain two distinct C–C ...
The compound is the prototypical antiaromatic hydrocarbon with 4 pi electrons (or π electrons). It is the smallest [n]-annulene ([4]-annulene).Its rectangular structure is the result of a pseudo [3] - (or second order) Jahn–Teller effect, which distorts the molecule and lowers its symmetry, converting the triplet to a singlet ground state. [4]
The following article contains mild spoilers from the Season 2 premiere of Unstable, now streaming on Netflix. For a light-hearted workplace comedy, the first season of Netflix’s Unstable left ...
Just as aromatic compounds exhibit exceptional stability, antiaromatic compounds, which deviate from Huckel's rule and contain a closed loop of 4n π electrons, are relatively unstable. The bridged bicyclo[3.2.1]octa-3,6-dien-2-yl cation contains only 4 π electrons, and is therefore "bishomoantiaromatic."
President Donald Trump signed an order to put tariffs on U.S. neighbors Canada and Mexico, as well as China, starting Tuesday. Canada and Mexico quickly announced retaliatory tariffs, while China ...
Italian Meatball Soup. With lots of mini meatballs plus onion, carrot, cabbage, potatoes, and celery, this soup is pure comfort. Once it's defrosted and reheated, that's when you can sprinkle on ...