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1,2,4-Trienes 1 were readily prepared in three steps [Eq. (2); Ms = methanesulfonyl]. See Supporting Information for details. (Chemical Equation Presented)
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The presence of the cyclopropane ring was confirmed mainly on the basis of the presence of geminal protons in a highfield region (δ, 0.1-0.6 ppm) with a small geminal coupling constant J, 3.2 Hz, features that are characteristic of cyclopropane derivatives. The structure was further confirmed by HMBC and differential NOE spectra. See Supporting Information for details of the assignment
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