Abstract
The synthesis of the 2-bromocyclooctenyl selenides, C 8H 12(Br)SeR ( 3a: R Me; 3b: R Et; 3c: R CH 2Ph), and the 2-bromocyclohexenyl selenides, C 6H 8(Br)SeR ( 4a: R Me; 4b: R Et; 4c: R CH 2Ph), is described. Compounds 3a–e and 4a, b react with K 2PtCl 4 to yield square planar platinum (II) complexes of the form trans-PtL 2Cl 2 ( 5a: L = 3a; 5b: L = 3b; 5c: L = 3c; 6a: L = 4a; 6b: L = 4b). The analogous palladium(II) complex trans-PdL 2Cl 2 ( 7c: L = 4c) has been prepared from Pd(C 6H 5CN) 2Cl 2. All new compounds have been characterised by NMR, infrared and mass spectroscope and microanalysts. Complexes 5a–c, 6a, b and 7c exist as a racemic mixture of two diastereoisomers related by inversion at selenium. NMR spectroscope shows that interconversion between these two isomers is slow for 5a–e, but faster for 6a, b and 7c.
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