当在丙酮中用卤化锂在回流下处理时,被修饰为对甲苯磺酸盐,PEG-磺酸盐或对甲苯磺酸盐的仲醇在反应中心发生构型转化,其中PEG-磺酸盐和对甲苯磺酸盐的反应性更高。在空间受限的情况下,淘汰是一个相互竞争的过程。相反,当用TiCl 4处理时,简单的仲磺酸盐使氯化物产物的构型部分反转。在这些条件下,在给定的烷基磺酸盐底物中观察到的任何构型保留都可能是由于相邻基团的参与或对碳正离子(或离子对)的非对映选择性攻击,而不是S N i机理。
Chiral metallocenes: the synthesis and X-ray crystal structures of TiCl<sub>2</sub>η<sup>5</sup>:η<sup>5</sup>-C<sub>5</sub>Me<sub>4</sub>SiMe<sub>2</sub>C<sub>5</sub>H<sub>3</sub>R<sup>*</sup>) (R<sup>* </sup>= menthyl or neomenthyl) and related compounds
作者:Paul Beagley、Philip Davies、Harry Adams、Colin White
DOI:10.1139/v01-034
日期:2001.5.1
The syntheses of the chiral ansa-metallocene complexes TiCl2(η5:η5-C5Me4SiMe2C5H3R*) (R* = menthyl (4a) or neomenthyl (4b)) are reported; initially 4a was obtained as a 3:1 mixture of (R:S) diastereoisomers, which differ only in which face of the asymmetrically substituted cyclopentadienyl ring is bonded to the titanium (chiral descriptor shown). The major diastereomer 4aR was crystallized out optically
Synthesis of terpenyl selenides derived from limonene, menthol, caranol, and myrtanol is described. Three methodologies for the synthesis of terpenyl selenonium salts are compared. The results of selenium-mediated epoxidation through the use of isoselenocineole derived from limonene and methyl terpenyl, phenyl terpenyl, diterpenyl selenides, and selenonium salts are presented. The influence of solvent
作者:M. Ya. Demakova、D. V. Sudarikov、S. A. Rubtsova、L. L. Frolova、A. V. Kuchin
DOI:10.1007/s10600-012-0153-0
日期:2012.3
Sulfonylimidazoles of monoterpenes of menthane, pinane, and carane nature were synthesized in 83-98% yields.
以 83-98% 的产率合成了薄荷烷、蒎烷和蒈烷性质的单萜烯磺酰亚胺唑。
Terpenyl tellurides—Synthesis and application in asymmetric epoxidation
作者:Jacek Ścianowski、Anna Banach、Agata J. Pacuła
DOI:10.1080/10426507.2015.1064925
日期:2016.2.1
method using sodium telluride and terpenyl tosylates. Methyl terpenyl, phenyl terpenyl, and diterpenyl tellurides were successfully used in tellurium ylide-mediated asymmetricepoxidation reaction. The best result of asymmetricepoxidation was obtained for dicaranyl telluride (d.r. cis:trans 11:89, e.r. trans 84:16).
图形摘要 摘要 这项工作展示了在甲碲酸钠或苯碲酸钠与来自对薄荷烷、carane 和蒎烷系统的适当甲苯磺酸萜烯酯反应中获得的一组新的不对称手性碲化物的合成。此外,对称的二萜碲化物是根据我们最近发表的方法使用碲化钠和甲苯磺酸萜酯制备的。甲基萜烯、苯基萜烯和二萜碲化物已成功用于碲叶立德介导的不对称环氧化反应。不对称环氧化的最佳结果是双卡兰基碲化物(dr cis:trans 11:89, er trans 84:16)。