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Green Chemistry
Page 4 of 4
ARTICLE
Journal Name
of C by superoxide and hydrogen abstraction by hydroperoxyl
radicals (HO2 ).
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·
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O
H2O
NH2
N
H
N
H
Intramolecular
Cyclization
A
N
H
2a
B
FI*
NH2
NH2
FI
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1a
FI*-
O2
O2
HO2
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H
N
H
N
H
H
N
HO2
N
N
H
N
H2O2
C
D
3a
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Scheme 3 The possible reaction mechanism.
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18 G. A. Molander, K. Ajayi, Org. Lett., 2012, 14, 4242.
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Conclusions
To sum up, we developed a method for the synthesis of by a
visible-light-induced condensation cyclization of aromatic
aldehydes and o-phenylenediamines using fluorescein as
20 P. Daw, Y. Ben-David, D. Milstein, ACS Catal., 2017, 7, 7456.
21 M. Karthik, P. Suresh, New J. Chem., 2018, 42, 17931.
22 M. Largeron, K. M. H. Nguyen, Synthesis, 2018, 50, 241.
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26 J. Kovvuri, B. Nagaraju, A. Kamal, A. K. Srivastava, ACS Comb.
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photocatalyst.
This
method
could
synthesize
2-
arylbenzimidazoles in moderate to excellent yields with good
functional group tolerance in mild conditions. In addition, the
catalytic system avoids the use of oxidants or metals, in line
with the concept of green chemistry. The development of
other photocatalytic studies is still in progress.
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Conflicts of interest
There are no conflicts to declare.
Acknowledgements
This work was supported by Fund of Natural Science
Foundation of Heilongjiang Province of China (No. B2018012).
Notes and references
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