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One referee pointed out that the references given in ref 2 are rather old (1966-1972). A thorough review of literature shows that such newer references describing mechanistic studies of photochemistry of N-hetero-cycles do exist as follows. Nevertheless, after we carefully checked these related papers, it was found that none of them are related to pyrazines, which we studied in this work. Also see (a) Liao, C.-C,; Hsieh, H.-P.; Lin, S.-Y. J. Chem. Soc., Chem. Commun. 1990, 545.
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33748302150
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More supporting evidence comes from the fact that by irradiation of pyrazine almost no reaction appears to take place at 3130 A. In fact, it had been shown that by exciting the molecule into singlet nπ* at 3130 A one can obtain triplet ππ* through the intersystem crossing without exciting the singlet ππ*. See (a) El-Sayed, M. A. J. Chem. Phys. 1962, 36, 373.
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33748304329
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note
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An excited state with geometry identical to the ground state is sometimes called a Franck-Condon (FC) state.
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28
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33646961862
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33748286929
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note
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The C-C, C-N, and C-H bonds in 2-methylpyrazine (3) are fixed to be 1.35, 1.35, and 1.09 Å, respectively. Also, the ∠CCC, ∠CNC, ∠HCC, and ∠CCN bond angles are fixed to be 120°, 120°, 120°, and 120°, respectively.
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32
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33748305788
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note
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0 species.
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34
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33748319543
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note
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For instance, 2-substituted thiophenes were found to rearrange into 3-substituted thiophenes, and 1,4-dimethylimidazoles into 1,2-dimethylimi-dazoles. For more experimental details, see ref 1.
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35
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33748291624
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Su, M.-D., to be submitted for publication
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Su, M.-D., to be submitted for publication.
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