Abstract
The reaction of [Ru(η 6- p-cymene)Cl 2] 2 with the chiral Schiff base ( S)-(α-methylbenzyl)-3,5-di- t-butylsalicylaldimine (HL*) in the presence of NEt 3 in CH 2Cl 2 forms a diastereomeric mixture of ( R Ru, S C)- and ( S Ru, S C)-[Ru(η 6- p-cymene)(L*)Cl] ( 1a, 1b). The crystal structure of the complex shows the presence of both the diastereomers in a 1:1 ratio in the triclinic space group P1. Both the structures exhibit the presence of a non-covalent CH–π interaction involving two p-cymene ring protons and the phenyl group attached to the chiral carbon. The 1H NMR spectra of the complex in CDCl 3 display the presence of two diastereomers in a 88:12 ratio at room temperature. The absolute configuration of the major diastereomer in solution has been determined by 2D NOE measurements. Observation of NOE cross peaks involving the C*H and the p-cymene ring protons indicates a ( R Ru, S C)- configuration of the major diastereomer in solution.
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