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Journal of Chemistry
/
2016
/
Article
/
Tab 5
/
Research Article
Ultrasonic-Assisted Synthesis of Two
t
-Butoxycarbonylamino Cephalosporin Intermediates on SiO
2
Table 5
Comparison of
1
H NMR data (
4b
).
Dai et al. reported (500 MHz, CDCl
3
)
Synthetic
4b
(300 MHz, DMSO-d
6
)
1.49 (s, 9H)
1.38 (s, 9H)
3.49, 3.57 (d, 2H,
J
= 14 Hz)
3.52 (d, 1H,
J
= 1.38 Hz)
3.66 (d, 1H,
J
= 17.97 Hz)
4.98 (d, 1H,
J
= 4 Hz)
5.12 (d, 1H,
J
= 4.14 Hz)
5.21 (d, 1H,
J
= 8 Hz)
—
5.65 (dd, 1H,
J
= 4, 8 Hz)
5.56 (s, 1H)
6.98 (s, 1H)
6.93 (s, 1H)
7.3–7. 5 (m, 10H)
7.27–7.49 (
, 10H)
7.38 (s, 1H)
8.01–8.04 (d, 1H,
J
= 8.49)
Data taken from [
7
];
this work.