Distribution of muons in substituted benzenes

Abstract

Muon polarization values are given in Table 7.1. P _D values range between 0.15 for unsubstituted benzene and 0.76 for thiophenol. They increase in the series X = F < Cl < Br < I and in X = CH₃ < CH₂C1 < CHCl₂ < CHCl₃, and they are higher for α-chloro toluenes than for chlorobenzene. They correlate with C — Cl bond dissociation energies and parallel the efficiency of the reaction of these compounds with electrons via dissociative capture [97].