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para-diethynylbenzene dianion; The gaseous state of all three anions are of theoretical interest. They have been generated by decarboxylation of benzene dipropynoic acids, using the technique of mass spectrometry. [1] [2] The three isomers of the dianion are the three strongest known superbases ever, with the ortho isomer being the strongest ...
The higher the proton affinity, the stronger the base and the weaker the conjugate acid in the gas phase.The (reportedly) strongest known base is the ortho-diethynylbenzene dianion (E pa = 1843 kJ/mol), [3] followed by the methanide anion (E pa = 1743 kJ/mol) and the hydride ion (E pa = 1675 kJ/mol), [4] making methane the weakest proton acid [5] in the gas phase, followed by dihydrogen.
The pH of a basic solution at standard conditions is greater than seven. Bases are bitter. [5] ... Ortho-diethynylbenzene dianion (C 6 H 4 (C 2) 2) 2 ...
It was the strongest known base until 2008, when the isomeric diethynylbenzene dianions were determined to have a higher proton affinity. The methanide ion CH − 3 was the strongest known base before lithium monoxide anion was discovered. [2] LiO − has a proton affinity of ~1782 kJ/mol. [3]
It is a powerful superbase; only the lithium monoxide anion (LiO −) and the diethynylbenzene dianions are known to be stronger. [ 5 ] In discussing mechanisms of organic reactions, methyl lithium and related Grignard reagents are often considered to be salts of CH − 3 ; and though the model may be useful for description and analysis, it is ...
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Karin Evans, Ph.D., R.D., C.H.E.S., remembers when the only “healthy” picks at drive-thrus were sad-looking salads. “Now, I feel like there’s so many choices,” she says. And menu variety ...