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24
-
-
0344773450
-
-
note
-
A pair of closely spaced singlets is centered at 6.0 ppm (vinyl protons). Intensities are comparable and the diastereomeric ratio is close to one.
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25
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0344341604
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-
33
-
-
0344341603
-
-
note
-
(b) Using the same procedure and solvent, we find ΔG‡= 19.4 kcal/mol for symmetrical salt 3n.
-
-
-
-
34
-
-
0001823894
-
-
(c) Rabiller, C.; Ricolleau, G.; Martin, M. L.; Martin, G. J. Nouv. J. Chem. 1980, 4, 35-42 report ΔG‡ = 20.7 kcal/mol for a rigid cyclobutene cyanine in TCE.
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-
-
Rabiller, C.1
Ricolleau, G.2
Martin, M.L.3
Martin, G.J.4
-
35
-
-
0345635999
-
-
note
-
This is confirmed for 3a by NOE solution measurements.
-
-
-
-
41
-
-
0345204051
-
-
note
-
One of three combustion elemental analytical values is unsatisfactory. Nevertheless, the compound was used successfully to prepare daughter vinamidinium salts of acceptable purity.
-
-
-
-
42
-
-
0345204052
-
-
note
-
Elemental analytical value for carbon is equivocal; NMR data fully support the assigned structure.
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