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15
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0041661936
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note
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2: C, 73.95; H, 5.52; N, 9.58%.
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16
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0041661935
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note
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1,2=3.9 Hz) in NOESY spectrum.
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20
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0041661933
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note
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When the reaction was carried out with other conditions such as (NaHMDS or LiHMDS, THF, -78 °C), and (DBU, toluene, rt), a mixture of 12 and 10α was obtained (12:10α = ca. 1:1 - 1:2).
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