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1
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0343167352
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Strictly speaking such "dimers" should be described as "dehydrodimers"
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Strictly speaking such "dimers" should be described as "dehydrodimers".
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The elimination step to ethyl 1,2-dimethyl-cyclopent-2-enoate was done by azeotropic removal of water with toluene and p-toluenesulfonic acid. Subsequent hydrolysis as described gave (rac)-8 in 72% yield (2 steps)
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0343602746
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note
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(31 ) This reaction sequence was first optimized with a simplified model system, bearing a tert-bulyl group instead of the chiral cyclopentyl residue; for the characterization of these compounds see the Supporting Information.
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