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In our hands, this compound is formed as a mixture of both E (13b) and Z (13a) isomers (separable by column chromatography, depending on the reaction temperature and solvent used. Moreover, we cannot account for the singlet at 3.33 ppm for the methoxy group as reported in ref 18b; rather, it appears at 3.71 ppm in the case of the (Z) isomer (13a) and 3.82 ppm in the case of 13b. Both (Z) and (E) isomers afford 18 upon photooxygenation. Upon catalytic hydrogenation, both yield the same partially reduced product 19, The experimental details are given in Supporting Information, Chemical Equation Presented
-
In our hands, this compound is formed as a mixture of both E (13b) and Z (13a) isomers (separable by column chromatography), depending on the reaction temperature and solvent used. Moreover, we cannot account for the singlet at 3.33 ppm for the methoxy group as reported in ref 18b; rather, it appears at 3.71 ppm in the case of the (Z) isomer (13a) and 3.82 ppm in the case of 13b. Both (Z) and (E) isomers afford 18 upon photooxygenation. Upon catalytic hydrogenation, both yield the same partially reduced product (19). The experimental details are given in Supporting Information. (Chemical Equation Presented)
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