97884-26-9Relevant academic research and scientific papers
Lawesson's reagent for direct thionation of hydroxamic acids: Substituent effects on LR reactivity
Przychodzen, Witold
, p. 676 - 684 (2007/10/03)
To explore the generality and scope of direct thionation of hydroxamic acids (HAs), the reaction of various structurally diverse HAs with Lawesson's reagent was investigated. The yield of thiohydroxamic acid (THAs) is poor when HAs possess bulky acyl and/or N-substituents, acidic α-hydrogen atoms, or an N-phenyl ring. THAs yields were correlated with Brown sigma parameter. The relative rates of two subsequent processes kT2 and kR2 were also measured. Correlation was also found for methine proton chemical shifts of N-isopropyl benzothiohydroxamic acids.
Substituent effects on 15N NMR chemical shifts in selected N-alkylthiohydroxamic acids. A comparative study
Przychodzen, Witold,Doszczak, Leszek,Rachon, Janusz
, p. 27 - 30 (2007/10/03)
The 15N NMR spectra of three N-alkyl-δ- carbomethoxyvalerothiohydroxamic acids (2) and six synthesized N-isopropylbenzothiohydroxamic acids (3) were measured and compared with appropriate spectra of structurally similar hydroxylamines (1), benz
The Photochromic Reaction of Methyl N-Isopropyl-4-nitrothiobenzimidate
Meese, Claus O.,Guesten, Hans
, p. 265 - 268 (2007/10/02)
Methyl N-isopropyl-4-nitrothiobenzimidate (1) exhibits reversible photochromism to a dark blue coloured species in the crystalline state only.Experimental evidence for a topochemically controlled nitro-aci-nitro tautomerism of 1 in the electronic excited
