Tautomerism and geometric isomerism of nitrogen containing derivatives of carbonyl compounds
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p-Nitrobenzaldehyde thiosemicarbazone and semicarbazone have quinonoid structures in an alkaline medium, and p-dimethylaminobenzaldehyde derivatives have quinonoid structures in an acid medium.
A study was made of the effect of S-methylation on the ultraviolet spectra of the thiosemicarbazones of benzaldehyde, acetophenone, cyclohexanone, and acetone.
It was shown that there is a hypsochromic shift of the absorption maximum as we pass to a polar solvent for some thiosemicarbazones and their S-methyl derivatives.
KeywordsNitrogen Acetone Carbonyl Absorption Maximum Acid Medium
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