Coupling of Titanacyclopentadienes with a Cp Ligand and Elimination of One Substituent
作者:Yuki Mizukami、Haijun Li、Kiyohiko Nakajima、Zhiyi Song、Tamotsu Takahashi
DOI:10.1002/anie.201403226
日期:2014.8.18
7‐tetrasubstituted indene derivatives without the loss of substituents by the treatment of titanacyclopentadienes with azobenzene without PMe3. 13C NMR spectroscopy of the product derived from a 13C‐enriched complex revealed that the five carbon atoms originating from a Cp ligand were arranged linearly in the trisubstituted indene derivatives, in contrast to the 4,5,6,7‐tetrasubsituted indene derivatives
由[Cp 2 TiBu 2 ]和二当量的炔烃或二炔制备的钛环戊二烯在50°C下用PMe 3(3当量)处理3 h,然后在室温下用偶氮苯处理12 h,得到4 ,5,6-三取代的茚衍生物,但失去一个取代基,收率很高。该反应与我们先前报道的通过不带PMe 3的偶氮苯处理钛环戊二烯而形成的4,5,6,7-四取代的茚衍生物而不损失取代基的反应形成了鲜明的对比。衍生自13的产物的13 C NMR光谱富含C的配合物表明,Cp配体中的五个碳原子在三取代的茚衍生物中呈线性排列,而4,5,6,7-四取代的茚衍生物中相应的五个碳原子呈线性排列戒指。