It was found that the magnetic field affected the photochemical isomerization of isoquinoline N-oxide to lactam in ethanol to cause an interesting variation in the yield of lactam. The results appear to indicate that there occurs a remarkable enhancement of the intersystem crossing from the excited singlet state of isoquinoline N-oxide by the magnetic field of approximately 10 kG.
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Norisuke Hata (1976) studied this question.
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