Preparation of metallacycles with anionic terdentate [C,N,N '] ligands by intramolecular oxidative addition of C-X (X = Br, Cl) bonds to [Pt(dba)(2)]. An unexpected effect of chloro substituents

摘要

The reactions of [Pt(dba)(2)] with ligands C6RnH5-nCHNCH2CH2NMe2 (1a, R = 2-Br; 1b, R = 2,3,4,5,6-Cl-5; 1c, R = 2,3,6-Cl-3, and 1d, R = 2,6-Cl-2) produce the corresponding [CNN'] cyclometalated platinum(H) compounds [PtX{C6RnH4-nCHNCH2CH2NMe2}] (2a-d) via intramolecular oxidative addition of C-Br or C-Cl bonds. All the new compounds were characterized by elemental analyses and mass and NMR spectroscopy, and [PtBr(Me2NCH2CH2NCHC6H4)] (2a) and [PtCl(M(e)2NCH(2)CH(2)NC(H)(3,5-C6H2Cl2)] (2f) were also characterized crystallographically. [References: 37]