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note
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Wittig Olefination gave a 95:5 mixture of (E:Z) isomers, with purification to homogeneity giving the desired (E)-isomer in 76% isolated yield and with a >99:1 (E:Z) ratio.
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83
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note
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1H NMR spectrum of the crude reaction product did not allow calculation of the diastereoselectivity of this reaction; but given the extensive precedent for the high stereoselectivity of this conjugate addition reaction, and the ee of the derived product 64, a diastereoselectivity of >95% was assumed.
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84
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note
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1H NMR spectroscopy and in comparison with racemic material.
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