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Compounds 4 and 5 were treated separately with dicyanodichloroquinone giving the isomericp-methoxybenzylidine acetals. The 'H NMR J-couplings for the oxygen-bearing methine protons (12 Hz axial, 5 Hz equatorial) were then used to make the synfanti assignments.
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39
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33947334412
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33847479032
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P = MOM, R = H. Four isomers where formed with' the approximate ratio: (2:l:l:trace). The stereochemistry was not assigned.
-
P = MOM, R = H. Four isomers where formed with' the approximate ratio: (2:l:l:trace). The stereochemistry was not assigned.
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0000295212
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0001866011
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