title: Isocyanate diinsertion into the N-H bond of the 2-pyridylamino ligand of organolanthanides.
abstract: [Cp2LnNHPy]2 (Py = 2-pyridyl) (1a-e) react with phenyl isocyanate to form the N-H diinsertion products Cp2Ln[eta2:eta1-PyNCON(Ph)CONHPh](THF) (Ln = Yb (3a), Er (3b), Y (3c), Dy (3d), Gd (3e)). It has been proven that nPr2NH can abstract one PhNCO unit from 3c to form Cp2Y[eta3-OC(NHPh)NPy] (2c) and nPr2NHCONHPh (4), representing a rare example of selective release of a functional group of ligands in organolanthanide chemistry. Hydrolysis of 2c gives the organic nitrogen-containing product PyNHCONHPh (5). Moreover, 3c can also be obtained by the reaction of 2c with PhNCO. These results demonstrate that the diinsertion of PhN=C=O into the N-H bond of coordinated amino ligands might proceed in a stepwise manner. All the compounds were characterized by elemental analysis and spectroscopic properties. The structures of compounds 3a-e and 4 are also determined through X-ray single-crystal diffraction analysis.
authors.affiliation: Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Sun
authors.forename: Zhengxing
authors.initials: Z
authors.lastname: Zhang
authors.forename: Xu
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Li
authors.forename: Linhong
authors.initials: L
authors.lastname: Weng
authors.forename: Xigeng
authors.initials: X
authors.lastname: Zhou