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13C NMR spectra of cyclohexane-1,3-dione derivatives were very complex as reported and we did not assign them. (a) Im, Y. J.; Lee, C. G.; Kim, H. R.; Kim, J. N. Tetrahedron Lett. 2003, 44, 2987.
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0346464721
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note
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+, 100).
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25
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0346464722
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note
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2bc The reaction of 8 and methanol in the presence of acid catalyst (p-TsOH) afforded the methylated derivative 9 in 71% yield, Conversely, the conversion of 9 into 8 could be carried out in the presence of water and acid catalyst (conc. HCl) in 59% yield (Scheme 3). From the experiment we could propose the structure of 4a-c and 6a as described tentatively.
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26
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0000047498
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