In organic chemistry, a diethynylbenzene dianion is an anion consisting of two ethynyl anions as substituents on a benzene ring. With the chemical formula C6H4C2−4, three positional isomers are possible, differing in the relative positions of the two substituents around the ring:
* ortho-diethynylbenzene dianion
* meta-diethynylbenzene dianion
* para-diethynylbenzene dianion
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| - Diethynylbenzene dianion (en)
- Dianion dietinilbenzena (in)
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| - In organic chemistry, a diethynylbenzene dianion is an anion consisting of two ethynyl anions as substituents on a benzene ring. With the chemical formula C6H4C2−4, three positional isomers are possible, differing in the relative positions of the two substituents around the ring:
* ortho-diethynylbenzene dianion
* meta-diethynylbenzene dianion
* para-diethynylbenzene dianion (en)
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| - Diethynylbenzene dianions.png (en)
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| - In organic chemistry, a diethynylbenzene dianion is an anion consisting of two ethynyl anions as substituents on a benzene ring. With the chemical formula C6H4C2−4, three positional isomers are possible, differing in the relative positions of the two substituents around the ring:
* ortho-diethynylbenzene dianion
* meta-diethynylbenzene dianion
* 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. The three isomers of the dianion are the three strongest known superbases ever, with the ortho isomer being the strongest, with a proton affinity of 1,843.987 kJ/mol (440.723 kcal/mol). The meta isomer is the second-strongest, and the para isomer is the third-strongest. (en)
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