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wavelength 351 nm for aqueous 0.5 M KCl and mercury electrode, Ethr
)
0.14 V (SCE).23c The most negative potential is determined by the
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aq
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+
(50) (a) RA of benzoate (20′) in aqueous solution has pKBH ) 12 for
+
protonation at CO2
.
- 50b For RAs of fluorinated benzoates, pKBH is expected
to decrease with fluorine atom accumulation. For the basicity of ring position
+
occupied by fluorine, the value pKBH ) 12.4, estimated for the hexafluo-
robenzene RA,50c can be assumed as typical. (b) Simic, M.; Hoffman, M.
Z. J. Phys. Chem. 1972, 76, 1398. (c) Shoute, L. C. T.; Mittal, J. P. J.
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(54) (a) The generation of RAs was observed directly from nonhalo-
genated arenes in system the Zn/OH--DMSO54b and from hypericin in
the systems Zn/DMF or Zn/DMF-H2O.54c The formation and cleavage of
RAs were proposed in the defluorination of perfluoroolefins by Zn/DMF54d
and perfluoroarenes by Zn/Cu in DMF-H2O.54e (b) Kishan, L. H.; Kanchan,
(25) Konovalov, V. V.; Bilkis, I. I.; Selivanov, B. A.; Shteingarts, V.
D.; Tsvetkov, Yu. D. J. Chem. Soc., Perkin Trans. 2 1993, 1707.