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32144442876
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note
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E- and Z-geometry of 3 was further confirmed by NOE experiments (Supporting Information).
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28
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0000035972
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32144448885
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note
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According to resonance structure ii, the oxa-2-cyclohexenyl substituent of 2c is considered to be of electron-withdrawing nature.
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30
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0004293179
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Oxford University Press: Oxford, U.K.; Chapter 4
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Kirby, A.J.1
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32144450620
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note
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13C NMR absorption due to an acyl CO usually appears at higher field than that of E-isomers. for example, (Z)-3b, 202.4 ppm versus (E)-3b, 195.4 ppm.
-
-
-
-
33
-
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32144445939
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-
note
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-1.
-
-
-
-
34
-
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32144454187
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-
note
-
The calculation was probed by using PM3 semiempirical energy minimizations (MOPAC2002 in CAChe Worksystem Pro 5.04).
-
-
-
-
35
-
-
32144436731
-
-
note
-
Formation of a small amount of conjugated amides iii as a byproduct was accompanied. In contrast to efficient condensations with aromatic aldehydes, the reaction of trans-cinnamaldehyde (2e) with 15 under the same conditions resulted in a low yield of the desired Z-adduct.
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37
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0010549679
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