|Title||INTRAMOLECULAR SELECTIVITY OF MUONIUM TOWARDS CHLORINATED AROMATIC-COMPOUNDS|
|Publication Type||Journal Article|
|Year of Publication||1994|
|Authors||Venkateswaran, K, Stadlbauer, JM, Laing, ME, Klugkist, J, Chong, DP, Porter, GB, Walker, DC|
|Type of Article||Proceedings Paper|
|Keywords||ADDITION-REACTIONS, AQUEOUS-SOLUTIONS, BENZOIC-ACID, HYDROGEN ISOTOPES, LEVEL-CROSSING RESONANCE, Pyrazine, WATER|
Muon resonance studies show that muonium atoms (Mu) in ethanol add selectively to certain C-sites of aromatic compounds containing -Cl and -OH substituents. The sites chosen seem to be those carrying the lowest electron density. This helps to characterize Mu as a nucleophile in addition reactions and, in this respect, Mu differs from ordinary H-atoms. The study shows no apparent inter-molecular selectivity between a pair of aromatic solutes in an equimolar mixture, but strong intra-molecular selectivity in an ether composed of those two aromatic rings. This difference between intra- and inter-molecular selectivity is interpreted as kinetic in origin - arising from the ’caging effect’ of the solvent and peculiar to reactions close to the diffusion-controlled limit.
|URL||<Go to ISI>://A1994PA11800018|