Abstract
The reaction of NH2OH with the derivatives of 2,2,5,5-tetramethylpyrrolin-1-oxyl-3-carboxylic acid in all events led to the formation of a mixture of the corresponding nitroxylhydroxamic acid with a stable O-acylhydroxylamine. The ratio between the products depends on the nature of the acylating agent and under the studied conditions varies from ∼5.5: 1 to 1: 3 indicating the comparable nucleophilicity in this reaction of N and O atoms in the hydroxylamine. The most active chloride of the mentioned acid alongside the indicated products afforded in a considerable yield N,O-diacylhydroxylamine and the triacylated hydroxylamine, 3-{[(2,2,5,5-tetramethyl-1-oxylopyrrolin-3-yl)carbonyloxyimino][(2,2,5,5-tetramethyl-1-oxylopyrrolin-3-yl)carbonyloxy]-methyl}-2,2,5,5-tetramethylpyrrolin-1-oxyl. The structure of both latter compounds was established by XRD analysis.
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Original Russian Text © V.D. Sen’, G.V. Shilov, V.A. Golubev, 2009, published in Zhurnal Organicheskoi Khimii, 2009, Vol. 45, No. 8, pp. 1199–1208.
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Sen’, V.D., Shilov, G.V. & Golubev, V.A. Synthesis and structure of products of hydroxylamine acylation with 3-carboxy-2,2,5,5-tetramethylpyrrolinoxyl derivatives. Russ J Org Chem 45, 1189–1199 (2009). https://doi.org/10.1134/S1070428009080132
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DOI: https://doi.org/10.1134/S1070428009080132