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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 28, Number 11
BKCSDE 28(11)
November 20, 2007 
 
Title
 Cyclometalated Platinum(II) Complexes Derived from a Chiral Pyridine Ligand: Synthesis, Structure, and Catalytic Activity
Author
 Myeong Sik Yoon, Dowook Ryu, Jeongryul Kim, Rengan Ramesh, Kyo Han Ahn*
Keywords
 Chiral ligand, Cycloplatination, X-ray structure, C-H···Cl hydrogen bonding, Asymmetric reactions
Abstract
 A direct cyclometalation of a chiral pyridine derivative, (5R,7R)-5,6,7,8-tetrahydro-6,6-dimethyl-2-phenyl- 5,7-methanoquinoline (L), with K2PtCl4 in acetic acid is described. A chiral mononuclear cyclometalated platinum(II) complex (6) was obtained, in which second L was simply coordinated by nitrogen. This new platinum(II) complex was characterized by 1H and 13C NMR spectroscopy, and further by X-ray crystallography. Both the solution and solid structures show C-H···Cl hydrogen bonding, which explains a distorted square-planar geometry in the solid state. A reactive cationic platinum(II) species (8) was generated from the chloro complex by treatment with silver triflate, whose catalytic efficiency was evaluated in asymmetric aldol and silylcyanation reactions of aldehydes.
Page
 2045 - 2050
Full Text
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