See Xin Yi, Beaumier Evan P, Davis-Gilbert Zachary W, Dunn Peter L, Larsen Jacob A, Pearce Adam J, Wheeler T Alex, Tonks Ian A
Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.
Organometallics. 2017 Apr 10;36(7):1383-1390. doi: 10.1021/acs.organomet.7b00096. Epub 2017 Mar 29.
Low-valent Ti species have typically been synthesized by the reaction of Ti halides with strong metal reductants. Herein we report that Ti species can be generated simply by reacting Ti imido complexes with 2 equiv of alkyne, yielding a metallacycle that can reductively eliminate pyrrole while liberating Ti. In order to probe the generality of this process, Ti-catalyzed alkyne trimerization reactions were carried out with a diverse range of Ti precatalysts.
低价钛物种通常是通过卤化钛与强金属还原剂反应合成的。在此我们报告，钛物种可以简单地通过钛亚胺配合物与2当量的炔烃反应生成，生成一种金属环，该金属环可还原消除吡咯同时释放出钛。为了探究这一过程的普遍性，使用多种钛预催化剂进行了钛催化的炔烃三聚反应。
