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1H NMR spectra according to previous results (see refs 3a, 3b, and 3e). The high E-selectivity was determined at the stage of rearrangement that prefers the s-trans conformation of the C(carbonyl)-C(α)-C(β)-C(γ) bond (see ref 3e).
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1H NMR spectra according to previous results (see refs 3a, 3b, and 3e). The high E-selectivity was determined at the stage of rearrangement that prefers the s-trans conformation of the C(carbonyl)-C(α)-C(β)-C(γ) bond (see ref 3e).
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30
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The yield of the product decreased since the isolation of the product from the byproducts turned out to be difficult
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The yield of the product decreased since the isolation of the product from the byproducts turned out to be difficult.
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31
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Cheng et al. reported the alkyne moiety bound to a more bulky group was more reactive. The difference probably stemmed from the sequence of cocyclization. In their proposed reaction mechanism, the 1,3-diyne was inserted into metallacycle, in our case being a component metallacycle. See: Jeevanandam, A.; Prasad, R.; Huang, K. I.-w.; Cheng, C.-H. Org. Lett. 2002, 4, 807-810.
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Cheng et al. reported the alkyne moiety bound to a more bulky group was more reactive. The difference probably stemmed from the sequence of cocyclization. In their proposed reaction mechanism, the 1,3-diyne was inserted into metallacycle, in our case being a component metallacycle. See: Jeevanandam, A.; Prasad, R.; Huang, K. I.-w.; Cheng, C.-H. Org. Lett. 2002, 4, 807-810.
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