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The structure of 8 was confirmed by X-ray crystallography.
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The structure of 8 was confirmed by X-ray crystallography.
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44
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76149135172
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The regiochemistry of the reactions was determined by analysis of 2D NMR spectra (COSY, HSQC, and HMBC) of the products.
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The regiochemistry of the reactions was determined by analysis of 2D NMR spectra (COSY, HSQC, and HMBC) of the products.
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45
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76149135816
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HF/6-31G//HF/6-311G(d, p) using Gaussian 03, Revision C.02
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HF/6-31G//HF/6-311G(d, p) using Gaussian 03, Revision C.02.
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The stepwise formation of [3 + 2] products might be considered a 5-(enolendo)-exo-trig closure, a disfavored process: Baldwin, J. E.; Lusch, M. J. Tetrahedron 1982, 38, 2939.
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49
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