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85030806494
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note
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Similar observations have been made earlier by Liwschitz and Irsay (quoted by Zilcha and Bachi, see Footnote 5 in Ref. 16). They note that "... reaction of other amines with maleic acid either in aqueous solution or otherwise did not give the required N-alkyl-aspartic acid but led to the formation of amine salts of maleic acid or to unidentified products"
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38
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85030812535
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note
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The solvents screened included DMF, tetrabutylurea, tetramethylurea, tri-n-butylphosphate, N-methylpyrrolidone and 1,3-dimethyl-3,4,5,6-tetrahydro- 2(1H)-pyrimidinone (DMPU)
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39
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85030807097
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note
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Isomerization of a 0.1 M solution of maleic acid into fumaric acid was attempted at 125°C in DMSO for 72 h. Less than 1% isomerization could be detected during this period. A control experiment with added NaBr (200 mol %) gave identical results. A mixture of maleic acid (3 mmol), n-hexylamine (1 mmol) and NaBr (6 mmol) in DMSO did not give any reaction even at +125°C except for the slow formation of n-hexylmaleamide
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15944381668
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Chem. Abstr. 90 1978 168021
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