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α,β-Unsaturated amides 1 were prepared following the method described in: Concellón, J. M.; Pérez-Andrés, J. A.; Rodriguez-Solla, H. Chem. Eur. J. 2001, 7, 3062-3068.
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(a) α,β-Unsaturated amides 1 were prepared following the method described in: Concellón, J. M.; Pérez-Andrés, J. A.; Rodriguez-Solla, H. Chem. Eur. J. 2001, 7, 3062-3068.
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Compounds 1e-g were easily obtained through the amination of cinnamoyl chloride in THF.
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(b) Compounds 1e-g were easily obtained through the amination of cinnamoyl chloride in THF.
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48
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34547955089
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(Z)-Cinnamamide 1h was obtained from the catalytic Lindlar's hydrogenation of N,N-diethyl-3-phenylpropiolamide.
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(c) (Z)-Cinnamamide 1h was obtained from the catalytic Lindlar's hydrogenation of N,N-diethyl-3-phenylpropiolamide.
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49
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0344391940
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(Z)-Amide 1o was prepared by using the method described in: Concellón, J. M.; Bardales, E. J. Org. Chem. 2003, 68, 9492-9495.
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(d) (Z)-Amide 1o was prepared by using the method described in: Concellón, J. M.; Bardales, E. J. Org. Chem. 2003, 68, 9492-9495.
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Although the reactions were all carried out on a 0.4 mmol scale, when this process was carried out on a 3 mmol scale no differences were observed. However, 4 equiv of CrCl2 were necessary; when a lower amount of CrCl2 was employed (3 equiv) lower yields were obtained see also Table 1
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2 was employed (3 equiv) lower yields were obtained (see also Table 1).
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Magnetic Resonance and Infrared Spectra of Cyclopropanes and Cyclopropenes
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This is based on the well-known resonance of the lone pair electron of the nitrogen atom with the carbonyl group. As a consequence of this conjugation the free rotation through the CO-N bond is restricted, being this CO-N bond is shorter than a C-N bond The Chemistry of Acid Derivatives Patai, S, Ed, John Wiley and Sons: New York, 1979; Supplement B
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This is based on the well-known resonance of the lone pair electron of the nitrogen atom with the carbonyl group. As a consequence of this conjugation the free rotation through the CO-N bond is restricted, being this CO-N bond is shorter than a C-N bond (The Chemistry of Acid Derivatives Patai, S., Ed.; John Wiley and Sons: New York, 1979; Supplement B).
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