在25°C的水中和水-丙酮混合物中,已研究了取代的噻吩-2-磺酰溴和氯化物的水解。在水中以及在含最多40%丙酮的水丙酮中获得具有向上凹度的弯曲Hammett图。对于富含丙酮(> 80%)的溶剂,哈米特图变为氯化物和溴化物均具有正斜率的直线。根据亲核试剂-硫键的形成和硫,卤素键在取代基,核试剂和溶剂的改变上的断裂之间的不同时机,对结果进行了合理化处理。More O'Ferrall势能面模型的应用与S N 2型机制一致,该机制可以向S N 1或S A转移N个过程取决于不同的因素。另一方面,Pross最近提出的VBCM模型进行的预测与实验结果相矛盾。苯甲酰氯和噻吩-2-磺酰氯的某些溶剂分解反应之间的比较表明,这两个亲电子中心之间存在相似的相似性。
2-Thiophenesulfonyl bromides having up to three additional substituents on the thiophene moiety selected from the group C.sub.1-4 alkyl, chloro and bromo. The compounds have antimicrobial utility.
Nucleophilic substitution at sulphonyl sulphur. Part 4. Hydrolysis of substituted thiophenesulphonyl halides in water–acetone mixtures
作者:Antonino Arcoria、Francesco P. Ballistreri、Emanuela Spina、Gaetano A. Tomaselli、Emanuele Maccarone
DOI:10.1039/p29880001793
日期:——
Hydrolysis of substituted thiophene-2-sulphonyl bromides and chlorides have been studied in water and in water–acetonemixtures at 25°C. Curved Hammett plots with an upward concavity are obtained in water and in water-acetone with up to 40% acetone. For solvents richer in acetone (>80%) the Hammett plots become straight lines with positive slopes for both chlorides and bromides. The result are rationalized
在25°C的水中和水-丙酮混合物中,已研究了取代的噻吩-2-磺酰溴和氯化物的水解。在水中以及在含最多40%丙酮的水丙酮中获得具有向上凹度的弯曲Hammett图。对于富含丙酮(> 80%)的溶剂,哈米特图变为氯化物和溴化物均具有正斜率的直线。根据亲核试剂-硫键的形成和硫,卤素键在取代基,核试剂和溶剂的改变上的断裂之间的不同时机,对结果进行了合理化处理。More O'Ferrall势能面模型的应用与S N 2型机制一致,该机制可以向S N 1或S A转移N个过程取决于不同的因素。另一方面,Pross最近提出的VBCM模型进行的预测与实验结果相矛盾。苯甲酰氯和噻吩-2-磺酰氯的某些溶剂分解反应之间的比较表明,这两个亲电子中心之间存在相似的相似性。
General Access to
<i>N</i>
−CF
<sub>3</sub>
Secondary Amines and Their Transformation to
<i>N</i>
−CF
<sub>3</sub>
Sulfonamides
作者:Leibing Wang、Jieping Wang、Sitao Ye、Beihan Jiang、Zihao Guo、Yasir Mumtaz、Wenbin Yi
DOI:10.1002/anie.202212115
日期:2022.12.5
A new and mild method for the generation of HF from triethylsilane and silver fluoride leads to a highlyefficient one-pot synthesis of N−CF3 secondary amines. Novel N−CF3 sulfonamides were constructed from these promising amine building blocks and sulfonyl bromides in an unprecedented route.