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Despite the substantial work that has been accomplished in this area, there exists considerable room for improvement as the current state of the art involves the use of highly sensitive organometallic reagents, often in stoichiometric quantities. For a discussion of efficiency and organic synthesis, see: Trost, B. M. Science 1991, 254, 1471-1477.
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85034463818
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Exposure of acetate 9 to the Tebbe or Petasis reagents has led only recovery of starting material or decomposition upon more vigorous reaction conditions (110 °C)
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Exposure of acetate 9 to the Tebbe or Petasis reagents has led only recovery of starting material or decomposition upon more vigorous reaction conditions (110 °C).
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25
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85034480666
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2 resulted in only 15% of 11
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2 resulted in only 15% of 11.
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85034463832
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We believe that this is due to coordination of the four oxygens about the Pyran ring with Ti. Addition of more than 5 equiv of reagent resulted in the isolation of significant quantities of alcohol 7 after aqueous workup
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We believe that this is due to coordination of the four oxygens about the Pyran ring with Ti. Addition of more than 5 equiv of reagent resulted in the isolation of significant quantities of alcohol 7 after aqueous workup.
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85034464884
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Thus far, we have been able to isolate 13 in 15% yield by extending the time of the reaction, completely decomposing enol ether 11 in the process. The major component from this preliminary experiment appears to be dimeric
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Thus far, we have been able to isolate 13 in 15% yield by extending the time of the reaction, completely decomposing enol ether 11 in the process. The major component from this preliminary experiment appears to be dimeric.
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85034462435
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We have tentatively identified the only other recognizable product from this reaction as the exocyclic enol ether from deprotonation and epoxide opening. Thus far, We have been unable to determine the relative stereo-chemistry at the carbon bearing the hydroxyl group in this compound
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We have tentatively identified the only other recognizable product from this reaction as the exocyclic enol ether from deprotonation and epoxide opening. Thus far, We have been unable to determine the relative stereo-chemistry at the carbon bearing the hydroxyl group in this compound.
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