Isotope effects in nucleophilic substitution reactions. IV. The effect of changing a substituent at the α carbon on the structure of S<sub>N</sub>2 transition states
作者:Kenneth Charles Westaway、Zbigniew Waszczylo
DOI:10.1139/v82-360
日期:1982.10.1
Kinetic studies, secondaryα-deuterium kinetic isotopeeffects, primary chlorine kinetic isotopeeffects (1), Hammett ρ values determined by changing the substituent in the nucleophile, and activation parameters have been used to determine the detailed (relative) structures of the transition states for the SN2 reactions between para-substituted benzyl chlorides and thiophenoxide ion. A rationale for
Selective approach to thioesters and thioethers via sp<sup>3</sup> C–H activation of methylarenes
作者:J. Feng、G.-P. Lu、C. Cai
DOI:10.1039/c4ra09450f
日期:——
Novel CDC approaches for the synthesis of thioesters and thioethers was developed via sp3 C–H activation of methylarenes and subsequent functionalization.
新型CDC方法用于合成硫酯和硫醚,通过对甲基芳烃进行sp3 C-H活化和随后的官能化。
A comparative study of Cu(II)-assisted vs Cu(II)-free chalcogenation on benzyl and 2°/3°-cycloalkyl moieties
作者:SANTOSH K SAHOO
DOI:10.1007/s12039-015-0981-0
日期:2015.12
A relative synthetic strategy toward intermolecular oxidative C −Chalcogen bond formation of alkanes has been illustrated using both Cu(II) assisted vs Cu(II) free conditions. This led to construction of a comparative study of hydrocarbon benzylic and 2∘/ 3∘-cycloalkyl moieties bond sulfenylation and selenation protocol by the chalcogen sources, particularly sulfur and selenium, respectively. In addition, this protocol disclosed the auspicious formation of sp3 C−S coupling products over leading the sp3 C−N coupling products by using 2-mercaptobenzothiazole (MBT) substrates.
Novel Ni(II) complexes with pincer type NHC-based ligands constitute highly active catalysts for the coupling reactions of aryl and benzyl halides in the presence of thiourea. The catalyst loading could be as low as 5 mol% for the conversion of 1 mmol of substrates to the products in high yields at low temperature under aerobic conditions.
Verfahren zur Herstellung von Trichlormethyl-substituierten aromatischen Verbindungen
申请人:BAYER AG
公开号:EP0061029A1
公开(公告)日:1982-09-29
Trichlormethyl-substituierte aromatische Verbindungen werden durch Chlorierung von Thioether der Formel
in der
Ar für einen gegebenenfalls substituierten Arylrest steht,
X Wasserstoff oder Halogen bedeutet, und
R' für gegebenenfalls substituiertes Alkyl, Aralkyl, die Nitrilgruppe, einen gegebenenfalls substituierten Arylrest oder die Gruppe
in der
Ar und X die oben angegebene Bedeutung haben, steht, hergestellt.
Die teilweise neuen Verbindungen können als Zwischenprodukte für Pflanzenschutzmittel verwendet werden.
三氯甲基取代的芳香族化合物是通过氯化式如下的硫醚得到的
在
Ar 代表任选取代的芳基、
X 是氢或卤素,以及
R' 代表任选取代的烷基、芳烷基、腈基、任选取代的芳基或以下基团
其中
Ar 和 X 具有上述含义。
部分新化合物可用作植物保护产品的中间体。