Summary
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1.
p-Nitrobenzaldehyde thiosemicarbazone and semicarbazone have quinonoid structures in an alkaline medium, and p-dimethylaminobenzaldehyde derivatives have quinonoid structures in an acid medium.
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2.
A study was made of the effect of S-methylation on the ultraviolet spectra of the thiosemicarbazones of benzaldehyde, acetophenone, cyclohexanone, and acetone.
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3.
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.
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Kitaev, Y.P., Budnikov, G.K. & Chernova, A.V. Tautomerism and geometric isomerism of nitrogen containing derivatives of carbonyl compounds. Russ Chem Bull 11, 1134–1137 (1962). https://doi.org/10.1007/BF00908387
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DOI: https://doi.org/10.1007/BF00908387