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84962470470
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3) δ 3.10 (endo), 3.35 (exo) ppm.
-
3) δ 3.10 (endo), 3.35 (exo) ppm.
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28
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0344340919
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In these types of compounds, the equilibrium, isomer distribution is solvent dependent; see: Morales-Ríos, M. S.; Suárez-Castillo, O. R.; Joseph-Nathan, P.J. Chem. Soc., Perkin Trans. 2 2000. 769-775.
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84962465379
-
-
3 because the acidic character of the later resulted in reconverted cyano lactones 1a-e in minor amounts, together with decomposition products.
-
3 because the acidic character of the later resulted in reconverted cyano lactones 1a-e in minor amounts, together with decomposition products.
-
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-
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33
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33646896742
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13C NMR example of a furo[3,2-b]indole, see: Tsai, A.-I.; Lin, C.-H.; Chiang, C.-P. Heterocycles 2005; 65, 2381-2394.
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0000485927
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Ikeda, M.1
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Yakura, T.4
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36
-
-
84962465370
-
-
The GC/MS of pure compounds 2e, 4e, and 5e provided identical retention times and mass spectral patterns.
-
The GC/MS of pure compounds 2e, 4e, and 5e provided identical retention times and mass spectral patterns.
-
-
-
-
37
-
-
84962465373
-
-
Compounds 2a, 2b, 4a, and 4b, according to their instability, could not be isolated at the pure state.
-
Compounds 2a, 2b, 4a, and 4b, according to their instability, could not be isolated at the pure state.
-
-
-
-
38
-
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84962465371
-
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Supporting Information; see the paragraph at the end of this paper regarding availability.
-
Supporting Information; see the paragraph at the end of this paper regarding availability.
-
-
-
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39
-
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84962423040
-
-
2-c3 is 84-86 ppm; see ref 12.
-
2-c3 is 84-86 ppm; see ref 12.
-
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40
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Morales-Ríos, M. S.; Espiñeira, J.; Joseph-Nathan, P. Magn. Reson. Chem. 1987, 25, 377-395.
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-
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84962359731
-
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Because C3-C8a bond breaking in 3a-e is expected to be disfavored in comparison to C3-C3a bond, breaking, the ring-contraction 2a-e to 3a-e should be essentially irreversible on enthalpic grounds.
-
Because C3-C8a bond breaking in 3a-e is expected to be disfavored in comparison to C3-C3a bond, breaking, the ring-contraction 2a-e to 3a-e should be essentially irreversible on enthalpic grounds.
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84962411399
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A significant shortening of the C3-C11 bond in 4d (1.407(3) ̊) and 4e (1.405(3) Å) as compared to the C3-C11 bond, in 3c (1.442(3) Å) was observed.
-
A significant shortening of the C3-C11 bond in 4d (1.407(3) ̊) and 4e (1.405(3) Å) as compared to the C3-C11 bond, in 3c (1.442(3) Å) was observed.
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more..
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84946893847
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(b) Miertus, S.; Scrocco, E.; Tomasi, J. Chem. Phys. 1981, 55, 117-129.
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Miertus, S.1
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67
-
-
84962347267
-
-
This result could indicate that the ionic path has a transition state too high in energy which, crosses the surface of the sigmatropic shift, or simply does not exist.
-
This result could indicate that the ionic path has a transition state too high in energy which, crosses the surface of the sigmatropic shift, or simply does not exist.
-
-
-
-
68
-
-
84962347264
-
-
-1 in the gas phase.
-
-1 in the gas phase.
-
-
-
-
72
-
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0000535805
-
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(a) Ross, J. A.; Seiders, R. P.; Lemal, D.M. J. Am. Chem. Soc. 1976, 98, 4325-4327.
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|