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note
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6c saponification of 8 gave a mixture of structures, apparently including the phenol 7 and tautomeric unsaturated lactams expected from acetate cleavage, but with the methyl ester intact. Under more forcing conditions (15% NaOH, reflux 1 h), both the ester and the lactam were cleaved to give 2-(1H-pyrrol-2-ylmethylene)succinic acid, the diacid corresponding to the Stobbe condensation product 3.
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25
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note
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7d we find a melting point of 148-149°C for 5.
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26
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0001178075
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