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(NH) S O as oxidant for hydroxylation of arylboronic acids,
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HOF$CH CN as oxidant for hydroxylation of arylboronic 23 General procedure for aerobic oxidation of aryl/heteroaryl
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boronic acids to phenols with ambient air: a ask was
charged with aryl/heteroaryl boronic acid 1 (0.5 mmol),
NaBO
3
as oxidant for hydroxylation of arylboronic acids, see:
N
2
H
4
$H
2 2 3
O (0.25 mmol, 14.4 mL), Cs CO (1.0 mmol, 329.1
(
a) P. Fontani, B. Carboni, M. Vaultier and G. Maas,
mg), H
2
O (2.5 mmol, 45.0 mL), and PEG-400 (2.0 g). Then,
ꢀ
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Chem. Soc., 1980, 102, 7591.
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0 NH OH as oxidant for hydroxylation of arylboronic acids,
2
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the ask was stirred at 80 C in open air for the indicated
time. At the end of the reaction, the reaction mixture was
acidied with dilute aqueous HCl and extracted with ethyl
acetate (3 Â 15 mL). The organic phases were combined,
and the volatile components were evaporated under
reduced pressure. The crude product was puried by
column chromatography on silica gel (petroleum ether–
ethyl acetate).
9
1
11 TBHP as oxidant for hydroxylation of arylboronic acids, see:
S.-M. Guo, L. Lu and H. Cai, Synlett, 2013, 24, 1712.
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