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40
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85088618712
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1H NMR spectrum of 12 shows a large coupling constant (J = 15.3 Hz) between the two olefinic protons attributable to the E configuration, which differs from a smaller J value (7-8 Hz) for Z configuration
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1H NMR spectrum of 12 shows a large coupling constant (J = 15.3 Hz) between the two olefinic protons attributable to the E configuration, which differs from a smaller J value (7-8 Hz) for Z configuration.
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45
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1542432610
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The ds value of 17 was determined by GC-MS on OV-1 column
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The ds value of 17 was determined by GC-MS on OV-1 column.
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47
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1542432626
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The two isomers were separated by chromatography on silica gel column. Their ratio was then determined by their weights
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The two isomers were separated by chromatography on silica gel column. Their ratio was then determined by their weights.
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48
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1542747650
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note
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13C NMR of our synthetic sample to those in refs 11 and 12 verified that the major isomer we obtained was the 10R natural product. The diagnostic NMR chemical shift of different THF subunits with various relative configurations in Annonaceous acetogenins showed that when the relative configuration of the THF ring and adjacent OH group was threo, the range of the chemical shift of the proton on the carbon with adjacent OH group was 3.34-3.41 ppm, and for the erythro isomer, the range of chemical shift was 3.80-3.90 ppm. For our synthetic sample, the chemical shift was 3.37 ppm, which was in accordance with the threo configuration. This observation further confirmed our identification. Equation Presented
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