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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 

Cyclometalated Platinum(II) Complexes Derived from a Chiral Pyridine Ligand: Synthesis, Structure, and Catalytic Activity
Myeong Sik Yoon, Dowook Ryu, Jeongryul Kim, Rengan Ramesh, Kyo Han Ahn*
Chiral ligand, Cycloplatination, X-ray structure, C-H···Cl hydrogen bonding, Asymmetric reactions
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.
2045 - 2050
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