茴香醇,对苯二酚,硫代苯甲醚,对-Kresolmethylather,Veratrol,2,5-二甲氧基甲苯,邻苯三酚三甲基醚,α-萘甲酰三甲基醚氯化物。溴乙醛zu,β-二芳基-β-卤代酮kondensiert,aus denen durch Abspal-tung von Halogenwasserstoff类似醇α,α-二芳基-ä在湿润的Ausbeute erhalten werden中。Dieauxochromhaltigenα,α-二芳基-β-卤代ä烷,位于Stilbene ab的Uhlagerung的HöhersiedendenLösungsmitteln中,位于alumerung的Salten Halogenwasserstoff。死于奥斯丁·辛德·维弗拉赫·定量论。
Site‐Fixed Hydroboration of Terminal and Internal Alkenes using BX
<sub>3</sub>
/
<sup>
<i>i</i>
</sup>
Pr
<sub>2</sub>
NEt**
作者:Sida Li、Chenyang Hu、Xin Cui、Jiong Zhang、Liu Leo Liu、Lipeng Wu
DOI:10.1002/anie.202111978
日期:2021.12.6
A novel and general method for the hydroboration of alkenes, including arylalkenes, 1,1-disubstitutedalkenes, aliphatic alkenes, and bio-derived alkenes, using BX3 as the boration reagent in the presence of iPr2NEt is reported. The reaction was also applied to the synthesis of linear and branched 1,n-diborylalkanes. The reaction is thought to proceed by a frustrated Lewis pair type single-electron-transfer
The substituent effect on the acetolysis of 2,2-bis(substituted phenyl)ethyl p-toluenesulfonates at 90.10 °C can be described accurately in terms of the Yukawa–Tsuno (LArSR) relationship, giving a ρ value of −4.44 and an r value of 0.53. The substituent effect correlation of this system carrying two aryls is quite comparable to that of the 2-methyl-2-phenylpropyl system carrying a single aryl group, suggesting the close similarity in the structure of the transition states between the systems. The results can be reasonably accounted for on the basis of the accepted mechanism of this reaction, involving a rate-determining aryl-assisted transition state where only one aryl group of the two β-aryl groups participates.