A Radical Addition/Cyclization and Se‐Group Transfer Strategy for the Facile Synthesis of Se‐Containing Cyclopentenes under Metal‐Free and Peroxide‐Free Conditions
作者:Dian‐Liang Wang、Nan‐Quan Jiang、Zhong‐Jian Cai、Shun‐Jun Ji
DOI:10.1002/chem.202103334
日期:2021.12.20
A highly atom-economic intermolecular radicaladdition/cyclization and Se-group transfer strategy was developed for the efficient synthesis of Se-containing cyclopentenes under metal-free and peroxide-free conditions.
<sup>77</sup>Se NMR Chemical Shifts of 9-(Arylselanyl)triptycenes: New Standard for Planar Structures of ArSeR and Applications to Determine the Structures in Solutions
作者:Takashi Nakamoto、Satoko Hayashi、Waro Nakanishi
DOI:10.1021/jo801786j
日期:2008.12.5
that of 1-(arylselanyl)anthraquinones (3 (pd)). Sets of delta(Se) of 1 and 2 must serve as the standard for pl and that of 3 does for pd in solutions. Structures of various ArSeR in solutions are determined from the viewpoint of the orientational effect based on the standard delta(Se) of 1-3. While the structure of 2-methyl-1-(arylselanyl)naphthalenes is concluded to be all pl in solutions, those of 8-chloro-
Stereoselective synthesis of (E)-vinylic selenides via hydrozirconation of alk-1-ynes
作者:Xian Huang、Liu-Sheng Zhu
DOI:10.1039/p19960000767
日期:——
Hydrozirconation of alk-1-ynes 1 gives organozirconium(IV) complexes 2, which are trapped with arylselenenyl bromides to afford (E)-vinylic selenides 3 in high yields.
A generalized <i>exo</i>‐anomeric effect. Substituent and solvent effects on the conformational equilibria of 2‐(arylseleno)cyclohexanones
作者:Ronald G. Mcleod、Blair D. Johnston、B. Mario Pinto
DOI:10.1560/gyn6-1prq-6kgf-0lva
日期:2000.12
The effects of substitution and solvent on the conformationalequilibria of 2-[(4-R-substituted-phenyl)seleno]cyclohexanones are described. The conformationalequilibria were determined by comparison of the linewidths of the H-2 resonances in the 1H NMR spectra of the conformationally averaged systems with those of the anancomeric (highly biased) 4-isopropyl-2-substituted cyclohexanones. The substituent
描述了取代和溶剂对2-[((4-R-取代-苯基)硒代]环己酮的构象平衡的影响。构象平衡是通过比较构象平均系统的1 H NMR光谱中的H-2共振的线宽与苯甲酸酯(高度偏置)的4-异丙基-2-取代的环己酮的线宽来确定的。取代基(R = NMe 2,OMe,Me,H,F,Cl,CF 3,NO 2)和溶剂((CD 3)2 CO,CD 3 CN,CD 2 Cl 2,CDCl 3根据静电效应和可能的稳定轨道相互作用对效应进行了讨论。的值ķ当量(轴向赤道)增加作为取代基变为多个吸电子,在与协议n的显性硒π* C = O或σ C-硒π * C = O轴向构象中的轨道相互作用。对于给定的取代基,在更多极性溶剂中赤道异构体比例的增加表明,在赤道异构体中偶极相互作用的衰减。但是,当取代基变得更吸电子时,给定溶剂中的赤道异构体比例会增加,这表明静电相互作用在控制构象平衡中并不占主导地位。通过双取代参数的方法的装置
Stereoselective Synthesis of (<i>E</i>)-α-Selenenylvinylsilanes via the Hydromagnesiation Reaction of Alkynylsilanes
作者:Mingzhong Cai、Hong Zhao
DOI:10.1055/s-2002-33123
日期:——
(E)-α-Selenenylvinylsilanes have been synthesized stereoselectivelyvia the hydromagnesiation of alkynylsilanes, followed by the reaction with arylselenenyl bromides. (E)-α-Selenenylvinylsilanes can undergo the desilylation reaction in the presence of a catalytic amount of hydriodic acid to give (E)-vinyl selenides in high yields.