Alkyne [2 + 2 + 2] Cyclotrimerization Catalyzed by a Low-Valent Titanium Reagent Derived from CpTiX3 (X = Cl, O-i-Pr), Me3SiCl, and Mg or Zn
Alkyne [2 + 2 + 2] Cyclotrimerization Catalyzed by a Low-Valent Titanium Reagent Derived from CpTiX3 (X = Cl, O-i-Pr), Me3SiCl, and Mg or Zn
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DOI：
10.1021/acs.organomet.8b00678
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发表时间：
2018-10
期刊：
影响因子：
2.8
通讯作者：
S. Okamoto;Takeshi Yamada;Yu-ki Tanabe;Masaki Sakai
中科院分区：
文献类型：
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作者：
S. Okamoto;Takeshi Yamada;Yu-ki Tanabe;Masaki Sakai
在Me 3SiCl存在下，用Mg或Zn粉还原CpTi（O-i-Pr）3、CpTiCl 3或Cp* TiCl 3原位生成低价钛物种，催化炔的分子间、部分分子内和分子内[2 + 2 + 2]环加成反应.讨论了Me 3SiCl作为添加剂在反应机理中的作用。
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.