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0343900488
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To the best of our knowledge, the only reported method to prepare (+)-(R,R)-dilactone 2 in enantiomerically pure form consists of resolution of racemic 3,4-dihydroxyhexanedioic acid and subsequent cyclization
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To the best of our knowledge, the only reported method to prepare (+)-(R,R)-dilactone 2 in enantiomerically pure form consists of resolution of racemic 3,4-dihydroxyhexanedioic acid and subsequent cyclization (Posternak, T.; Susz, J.-P. Helv. Chim. Acta 1956, 236, 2033).
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0343900485
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Diethyl 3,4-dioxohexanedioate was obtained by Claisen condensation of ethyl acetate with diethyl oxalate in 33% yield
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Diethyl 3,4-dioxohexanedioate was obtained by Claisen condensation of ethyl acetate with diethyl oxalate in 33% yield (Lipiec, T. Acta Pol. Pharm. 1938, 2, 140).
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20 -80.9 (c 0.865, AcOEt)}
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20 -80.9 (c 0.865, AcOEt)}.
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