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(80 mL) of the reaction mixture were withdrawn and quenched
with 80 mL of a 10 mM solution of HClO4 in 80% DMSO. Aer
addition of p-hydroxybenzoic acid (internal standard) in 80%
DMSO, the solution was ltered and subjected to HPLC analysis
by elution with H2O (0.1% triuoroacetic acid)/MeCN, linear
D. M. Perrin, ChemBioChem, 2009, 10, 1988; (f)
¨
H. Lonnberg, Org. Biomol. Chem., 2011, 9, 1687; (g)
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3 D. O. Corona-Martinez, O. Taran and A. K. Yatsimirsky, Org.
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gradient from 100 : 0 to 85 : 15 in 25 min, ow 0.9 mL minꢁ1
.
The pseudo-rst-order rate constant for the hydroxide catalyzed
cleavage of UpU was measured at 50.0 ꢂC in the presence of 1.0
mM Me4NOH (pOH 3.0), 10 mM Me4NClO4, by HPLC moni-
toring of the nucleoside liberation (initial rate method).
4 L. Baldini, R. Cacciapaglia, A. Casnati, L. Mandolini,
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5 R. Salvio, L. Mandolini and C. Savelli, J. Org. Chem., 2013, 78,
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6 F. A. Cotton, E. E. Hazen Jr and M. J. Legg, PNAS, 1979, 76,
2551.
Acknowledgements
`
Thanks are due to the Ministero dell‘Istruzione e dell’Universita
7 R. Salvio, A. Casnati, L. Mandolini, F. Sansone and
R. Ungaro, Org. Biomol. Chem., 2012, 10, 8941.
8 L. Pasquato, P. Pengo and P. Scrimin, J. Mater. Chem., 2004,
14, 3481.
e della Ricerca (MIUR, PRIN 2010 JMAZML-006) and La Sapi-
enza – Ateneo 2013 for nancial support. Prof. Mandolini is
warmly acknowledged for the fruitful discussions.
9 S. Roy and M. A. Pericas, Org. Biomol. Chem., 2009, 7, 2669.
10 A. Schatz, O. Reiser and W. J. Stark, Chem.–Eur. J., 2010, 16,
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28682 | RSC Adv., 2014, 4, 28678–28682
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