Alkyne Hydroamination and Trimerization with Titanium Bis(phenolate)pyridine Complexes: Evidence for Low-Valent Titanium Intermediates and Synthesis of an Ethylene Adduct of Titanium(II)
作者:Ian A. Tonks、Josef C. Meier、John E. Bercaw
DOI:10.1021/om400080g
日期:2013.6.24
class of titanium precatalysts of the type (ONO)TiX2 (ONO = pyridine-2,6-bis(4,6-di-tert-butylphenolate); X = Bn, NMe2) has been synthesized and crystallographically characterized. The (ONO)TiX2 (X = Bn, NMe2, X2 = NPh) complexes are highly active precatalysts for the hydroamination of internal alkynes with primary arylamines and some alkylamines. A class of titanium imido/ligand adducts, (ONO)Ti(L)(NR)
已经合成了一类(ONO)TiX 2(ONO =吡啶-2,6-双(4,6-二叔丁基苯酚酸酯); X = Bn,NMe 2)钛预催化剂,并进行了晶体学表征。(ONO)TiX 2(X = Bn,NMe 2,X 2 = NPh)配合物是高活性的预催化剂,用于内部炔烃与伯芳基胺和某些烷基胺的加氢胺化。一类钛亚氨基/配体加合物(ONO)Ti(L)(NR)(L = HNMe 2,py; R = Ph,t Bu)也已合成并表征,并据称为中间体提供了结构类似物催化循环。此外,这些配合物表现出不同寻常的氧化还原行为。(ONO)钛2(1)可能通过1的原位生成的具有催化活性的Ti II物种促进富电子炔烃的环三聚。根据反应条件,建议这些Ti II物质是通过Ti亚苄基或亚氨基中间体生成的。甲正式的Ti II复合物,(ONO)的Ti II(η 2 -C 2 H ^ 4)(HNME 2)(7),已经制备和结构表征。