@article {3185, title = {INTRAMOLECULAR SELECTIVITY OF MUONIUM TOWARDS CHLORINATED AROMATIC-COMPOUNDS}, journal = {Hyperfine Interactions}, volume = {87}, number = {1-4}, year = {1994}, note = {ISI Document Delivery No.: PA118Times Cited: 0Cited Reference Count: 166th International Conference on Muon Spin Rotation/Relaxation/ResonanceMAY 31-JUN 11, 1993MAUI, HI}, pages = {947-952}, type = {Proceedings Paper}, abstract = {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 {\textquoteright}caging effect{\textquoteright} of the solvent and peculiar to reactions close to the diffusion-controlled limit.}, keywords = {ADDITION-REACTIONS, AQUEOUS-SOLUTIONS, BENZOIC-ACID, HYDROGEN ISOTOPES, LEVEL-CROSSING RESONANCE, Pyrazine, WATER}, isbn = {0304-3843}, url = {://A1994PA11800018}, author = {Venkateswaran, K. and Stadlbauer, J. M. and Laing, M. E. and Klugkist, J. and Chong, D. P. and Porter, G. B. and Walker, D. C.} }