Imidazolin-2-iminato Ligand-Supported Titanium Complexes as Catalysts for the Synthesis of Urea Derivatives
作者:Kishor Naktode、Suman Das、Jayeeta Bhattacharjee、Hari Pada Nayek、Tarun K. Panda
DOI:10.1021/acs.inorgchem.5b02302
日期:2016.2.1
titanium complex 1c was utilized as a precatalyst for the addition of amine N–H bond to phenyl isocyanate. High yields of the corresponding urea derivatives were achieved under mild conditions. The mechanistic study of the aforementioned catalytic reaction was performed, and the active catalyst complex 7b was isolated using 2 equiv of iminopyrrole [2-(2,6-iPr2C6H3N═CH)C4H3NH] and the complex 4b. The
四(二甲基氨基)钛(IV)[Ti(NMe 2)4 ]与三种不同的咪唑啉-2-亚胺(Im R NH; R =叔丁基(t Bu),1,2,3,5-二甲基)反应6-二异丙基苯基(Dipp))提供了相应的咪唑啉-2-亚氨基钛络合物[(Im R N)Ti(NMe 2)3 ](R = t Bu,1a ; R = Mes,1b ; R = Dipp,1c) 。复杂的治疗1A与两个不同的碳二亚胺[R'N═C═NR'; R'=环己基(Cy)和异丙基(iPr)]形成[(Im R N)Ti(R'NC(NMe 2)NR')(NMe 2)2(R'= i Pr; R = t Bu(2a),R = Dipp(2c); R'= Cy,R = t Bu(3a)],为黄色固体,产率为94%,但是1b和1c与2的反应相似在环境温度苯基异氰酸酯的当量导致对应钛,二的形成(ureate)配合物[(IM [R N)的Ti κ 2 -OC(NME