Lawesson's reagent for direct thionation of hydroxamic acids: Substituent effects on LR reactivity
作者:Witold Przychodzeń
DOI:10.1002/hc.20259
日期:——
To explore the generality and scope of direct thionation of hydroxamicacids (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
The Thermal Decomposition of<i>N</i>,<i>O</i>-Diacyl-<i>N</i>-<i>t</i>-butylhydroxylamines
作者:Yuzuru Uchida、Yukinobu Hashimoto、Seizi Kozuka
DOI:10.1246/bcsj.53.2309
日期:1980.8
Several N,O-diacyl-N-t-butylhydroxylamines and O-acyl-N-t-butylhydroxylamines were prepared, and their thermal decompositions were studied. The thermal decompositions of N,O-diacyl-N-t-butylhydroxylamines in tetralin gave substituted N-t-butylbenzamides, carboxylic acids, 1,1′-bitetralyl, and 1,2-dihydronaphthalene as the major products, together with small amounts of carbon dioxide, t-butylamine, and benzanilides. In the thermal decompositions of O-acyl-N-t-butylhydroxylamines, the products were t-butylamine, carboxylic acids, substituted N-t-butylbenzamides, 1,1′-bitetralyl, and 1,2-dihydronaphthalene.
Acylierungen und (N←O)-Umacylierungen von Hydroxamsäure-Derivaten
作者:G. Zinner、B. Geister
DOI:10.1002/ardp.19743070110
日期:——
Es wird über den Verlauf der Acylierung von Hydroxylaminen mit tert. C‐Atom in Nachbarstellung zur Hydroxylamin‐Funktion berichtet. Die durch Addition an Isocyansäureester erhaltenen Hydroxyharnstoff‐Derivate lagern beim Erwärmen auch in inerten Lösungsmitteln in die O‐carbamoylierten Isomere um.
它正在进行羟胺与叔的酰化过程。报道了羟胺功能附近的 C 原子。通过与异氰酸酯加成获得的羟基脲衍生物在加热时重新排列成 O-氨基甲酰化异构体,即使在惰性溶剂中也是如此。
Solvent Effects on Homolytic Bond Dissociation Energies of Hydroxylic Acids
作者:Frederick G. Bordwell、Wei-Zhong Liu
DOI:10.1021/ja961469q
日期:1996.1.1
kcal/mol. For most of these hydroxylic acids, the BDEs of the O−H bonds estimated by eq 1 are within ±2 kcal/mol of the literature values in nonpolar solvents or in the gas phase. There is no reason to believe, therefore, that these BDEs are “seriously in error because of failure to correct for solvent effects” as has been claimed on the basis that BDEs in highly polar solvents estimated for the O−H bond
Reaction of<i>N</i>-Aroyl-<i>N</i>-<i>t</i>-butylhydroxylamines with Thionyl Chloride. Synthesis of Substituted Benzohydroximoyl Chlorides
作者:Yuzuru Uchida、Seizi Kozuka
DOI:10.1246/bcsj.57.2011
日期:1984.7
The reaction of N-benzoyl-N-t-butylhydroxylamine with thionylchloride in carbon tetrachloride gave O-chlorosulfinylbenzohydroximoyl chloride as the main product. On treating with ethanol, the compound gave benzohydroximoyl chloride in good yield. The reaction was applied to the synthesis of substituted benzohydroximoyl chlorides.