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29
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8644261117
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note
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1H NMR of 2 showed a significantly low field shifted singlet at δ = 8.53 ppm accounting for an OH group being part of a hydrogen bridge.
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30
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8644257851
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note
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+, 161 (16), 149 (10), 143 (23), 132 (27), 111 (32), 98 (100), 84 (67), 55 (71).
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31
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8644220046
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note
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In a control experiment we could show that diketone 3 did not react further to give the corresponding 1,2,3-trione, even if large excess of sodium nitrite in combination with longer reaction times was used.
-
-
-
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32
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8644243376
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note
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2 and 25 mL of concd HCl. The crude product was purified either by filtration over a pad of silica gel (5:1) using hexane-EtOAc (50:1) as eluent or by crystallization from hexane-EtOAc.
-
-
-
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33
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8644260358
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note
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3 (241.33): C, 64.70; H, 9.61; N, 5.80. Found: C, 64.83; H, 9.70; N, 5.88.
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-
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34
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0141520392
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Rüedi, G.; Nagel, M.; Hansen, H.-J. Org. Lett. 2003, 5, 2691.
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Rüedi, G.1
Nagel, M.2
Hansen, H.-J.3
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35
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8644259530
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-
note
-
+], 77 (75), 69 (100), 55 (94).
-
-
-
-
36
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8644245421
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-
note
-
Several reactions were conducted on a 20 g scale.
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