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16
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15
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1542759987
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note
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The other oxygen substituents such as 2-(ethoxy)ethyloxy and pivaloyloxy groups were ineffective.
-
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16
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1542759985
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note
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Both 2a and 3a were found to exist as a >95:5 equilibrium mixture of the keto and enol forms.
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1542654770
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note
-
1H NMR data of H-1 and H-3 protons of 2a-e 2 H-1 H-3 a 3.13 (d, J = 12.2 Hz) 4.33 (t, J = 3.9 Hz) b 3.28 (d, J = 12.2 Hz) 4.44 (dd, J = 5.8 and 2.7 Hz) c 3.14 (d, J = 12.0 Hz) 4.43 (t, J = 3.6 Hz) d 3.15 (d, J = 12.0 Hz) 4.43 (t, J = 3.7 Hz) e 3.16 (d, J = 11.5 Hz) 4.51 (t, J = 3.6 Hz)
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28
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