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16
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0345073804
-
-
note
-
4) and evaporation of the solvent the residue was crystallised from ethanol.
-
-
-
-
17
-
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0344643135
-
-
note
-
Dehydration of the hemiaminals was carried out either in ethyl acetate or in chloroform adding one drop of glacial acetic acid and refluxing the solutions for about 1 hour.
-
-
-
-
19
-
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0344643134
-
-
note
-
Preparation of compounds 3c-d, 5, 7 and 8: 0.01 mol of 1 was dissolved in 30 ml of ethanol, containing (0.01 mol) of EtONa. 0.01 mol of the enone was added, and the solution heated at reflux. After cooling the crystalline product was filtered, or the ethanol solution evaporated, water was added and extracted with dichloromethane. After drying and evaporation of the solvent the residue was crystallised from ethanol.
-
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-
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20
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1542691837
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Fawcett, F. S. Chem. Rev. 1950, 47, 219; Wiseman, J. R.; Pletcher, W. A. J. Am. Chem. Soc. 1970, 92, 956; Chong, Wiseman, J. R. J. Am. Chem. Soc. 1972, 94, 8627.
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21
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0000930720
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Pletcher, W.A.2
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0344211582
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Fawcett, F. S. Chem. Rev. 1950, 47, 219; Wiseman, J. R.; Pletcher, W. A. J. Am. Chem. Soc. 1970, 92, 956; Chong, Wiseman, J. R. J. Am. Chem. Soc. 1972, 94, 8627.
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Chong, W.J.R.1
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23
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0345505391
-
-
note
-
ax-7), 6.63 (1H, s, H-8), 3.89 (3H, s, 9-MeO), 3.94 (3H, s, 10-MeO) 7.70 (1H, s, H-11).
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