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The structure and dynamic properties of 1H-pyrazole-4-carboxylic acids in the solid state
Authors
Rosa M. Claramunt
José Elguero
+3 more
Garcia, M. A. García
L. Infantes
C. López
Publication date
4 October 2013
Publisher
'Walter de Gruyter GmbH'
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Abstract
The structure of three simple pyrazole-4-carboxylic acids unsubstituted in position 1 (NH derivatives) 1H-pyrazole-4-carboxylic acid (1), 3(5)-methyl-1H-pyrazole-4-carboxylic acid (2) and 3,5-dimethyl-1H-pyrazole-4- carboxylic acid (3) are discussed based on crystallographic results (two new structures) and solid-state NMR (CPMAS). Compounds 1 and 3 present polymorphism and one of the polymorphs of each compound shows solid-state proton transfer (SSPT). Compound 2 presents tautomerism that has been studied by NMR, both in the solid-state and in solution at low temperature. © by Oldenbourg Wissenschaftsverlag, München.Peer Reviewe
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Last time updated on 25/05/2016