Alkyne [2 + 2 + 2] Cyclotrimerization Catalyzed by a Low-Valent Titanium Reagent Derived from CpTiX<sub>3</sub> (X = Cl, O-<i>i</i>-Pr), Me<sub>3</sub>SiCl, and Mg or Zn
作者:Sentaro Okamoto、Takeshi Yamada、Yu-ki Tanabe、Masaki Sakai
DOI:10.1021/acs.organomet.8b00678
日期:2018.12.10
Inter-, partially intra-, and intramolecular [2 + 2 + 2] cycloadditions of alkynes were catalyzed by a low-valent titanium species generated in situ from the reduction of CpTi(O-i-Pr)3, CpTiCl3, or Cp*TiCl3 with Mg or Zn powder in the presence of Me3SiCl. The role of Me3SiCl as an additive in the reaction mechanism is discussed.
CpTi(O- i- Pr)3,CpTiCl 3或Cp还原原位生成的低价钛物质催化炔烃的分子间,部分内和分子内[2 + 2 + 2]环加成反应*在Me 3 SiCl的存在下,带有Mg或Zn粉末的TiCl 3。讨论了Me 3 SiCl作为添加剂在反应机理中的作用。