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Chem. 1997, 62, 6245–6251; (g) Pandey, G.; Hajira, S.; Ghorai,
M. K.; Kumar, K. R. J. Am. Chem. Soc. 1997, 119, 8777–8787;
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Areas (Area No. 417), respectively. E.H. thanks financial
support from the Uchida Energy Science Promotion Founda-
tion. H.I. gratefully acknowledges financial support from the
Izumi Science and Technology Foundation and the Shorai
Foundation. We thank Dr. D. D. M. Wayner (National
Research Council of Canada) for his valuable comments
on electrochemistry. We also thank Professor K. Okada
(Osaka City University) for his donation of Ru(bpy)3Cl2.
Generous assistance provided by Professors T. Horaguchi
(Niigata University), M. Ueda (Tohoku University), and
S. Tero-Kubota (Tohoku University) is also acknowledged.
8. Although these pyrenes and anthracenes are previously known
(Ref. 9) and both BDMAP (Refs. 6,7d) and DMA (Ref. 7a,h)
have been used for some PET reactions, PET reactions of
DMP and BDMAA have not been reported. In addition, no sys-
tematic study on the utilities of these four compounds as sensi-
tizers for PET reactions has been conducted.
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red
1=2
14. Reduction potentials (E in V vs SCE) of some representative
substrates are ꢁ1.59 V for 1a, ꢁ1.82 V for 3, and ꢁ1.78 V for
7, respectively. In the cases of 1b, 1c, and 5a, the reduction
peaks were not observed below ꢁ2.3 V.
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Weller, A. Z. Phys. Chem. Neue Folge 1982, 133, 93–98.
16. In principle, a polar solvent accelerates initial PET processes
(Refs. 3,15,17), and is desirable for a PET reaction involving
sensitization. However, if a reaction requires a chemical pro-
cess within a radical ion pair, e.g., proton transfer from a radical
cation to a radical anion (Ref. 17), nonpolar solvents are in
some cases more favorable to lead better yields of products