DDQ is a benzoquinone derivative with some electron-withdrawing substituents, making it a bit more potent:
It's a bit more soluble than stuff like KMnO4, but not by much - it's a nightmare to work with.
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Nitromethane has some odd properties, due to the singular weirdness of the nitro group.
The electron-withdrawing nature of the group makes it a decent acid; in neutral (i.e., pH 7) water, about 1 in 1000 molecules of nitromethane will have a formal negative charge on the carbon and exist as CH2NO2…
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But gives wonderful results.