Abstract
Publisher Summary This chapter focuses on the magnetic field and magnetic isotope effects on the products of organic reactions. The chapter discusses reactions of radical pairs and examines the spin states of radical pair systems as archetypes. The crucial condition for observation of magnetic field effects is a competition between two processes: one of the processes must be magnetic field dependent and the other is magnetic field independent. As for magnetic field effects, magnetic isotope effects are generally very small or negligible in homogeneous solution, but may become significant in microheterogeneous environments, such as micelles. The chapter illustrates an example of a magnetic isotope effect involving 17 O, occurring in the thermolysis of endoperoxides of aromatic compounds. The decomposition of certain endoperoxides produces singlet molecular oxygen and the yield of singlet oxygen is magnetic field dependent. Such effects have been observed in many different kinds of chemical systems, and are readily interpreted in terms of the well-established principles of chemically induced magnetic polarization.
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