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22
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85034122607
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(R)-Enantiomer-enriched 3a with 0-59% ee was generated
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(R)-Enantiomer-enriched 3a with 0-59% ee was generated.
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23
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85034121558
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Potassium carbonate was usable. Satisfactory results were obtained by using solid bases pulverized as small as possible
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Potassium carbonate was usable. Satisfactory results were obtained by using solid bases pulverized as small as possible.
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25
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85034138115
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note
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There has recently appeared an interesting temperature-dependent switching of enantioselectivity (<42.3% ee) in a desymmetric carbamoylation of 2-substituted 1,3-propanediol using catalyst A; see ref 2c. However, the enantioselectivity in A-catalyzed benzoylation of the 1,3-diol was 0% in our hand.
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26
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0348210598
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and references therein
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Acylation of dibutylstannylene acetals was well documented, for example: (a) Hanessian, S.; David, S. Tetrahedron 1985, 41, 643 and references therein.
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