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- W2019998351 abstract "The following cresolphthalein (CP) derivatives are prepared from 5,5′-dibromocresolphthalein (3): 5,5′-dicyano (7), 5,5′-dicarbomethoxy (9); 5-bromo-5′-cyano (8), 5-bromo-5′-carbomethoxy (10), monomethyl ether (11) and 5,5′-dibromo monomethyl ether (13). The lactone ring remains intact in the monobasic forms of 11 and 12. The dibasic forms of the CP derivatives 3 and 8–10 show long-wavelength absorption bands, but exist mainly as the closed lactone structure. The dibasic form of 7 does not show long-wavelength absorption and exists only as the closed lactone structure. The proportion of ring-closed dianion goes as the electron-withdrawing ability of the substituents, and it increases in the order H<Br<CO2CH3<CN. Acidity constants are reported. They correlate with acidity of the related phenols, but not with the electronic characteristics of the substitutents. The first and second ionization constants are well-resolved in the unsymmetrical derivatives 8 and 10. AM1 calculations predicting optimal structures, uv/vis transitions and various equilibria are reported." @default.
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- W2019998351 date "2003-12-01" @default.
- W2019998351 modified "2023-10-14" @default.
- W2019998351 title "Structure and properties of some cresolphthalein derivatives" @default.
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- W2019998351 doi "https://doi.org/10.1016/s0143-7208(03)00116-5" @default.
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