scholarly journals A Study of the Acid Dissociation of Furan- and Thiophenedicarboxylic Acids and of the Alkaline Hydrolysis of Their Methyl Esters

1965 ◽  
Vol 38 (8) ◽  
pp. 1247-1253 ◽  
Author(s):  
Shigeru Oae ◽  
Naomichi Furukawa ◽  
Takao Watanabe ◽  
Yoshio Otsuji ◽  
Masayuki Hamada
Keyword(s):  
Alkaline Hydrolysis ◽  
Methyl Esters ◽  
Acid Dissociation ◽  
Hydrolysis Of

Synthesis and properties of 5-styryl-2-furancarboxylic acids

1981 ◽  
Vol 46 (11) ◽  
pp. 2724-2728 ◽  
Author(s):  
Viera Knoppová ◽  
Anton Beňo ◽  
Jaroslav Kováč
Keyword(s):  
Ir Spectra ◽  
Transmission Coefficient ◽  
Alkaline Hydrolysis ◽  
Methyl Esters ◽  
Uv And Ir Spectra ◽  
Substituted Benzaldehydes ◽  
Hydrolysis Of

5-(4-X-Styryl)-2-furancarboxylic acids (X = H, Br, NO2, COOCH3, (CH3)2N) were prepared by oxidation of the appropriate 5-(4-X-styryl)-2-furaldehydes, or alternatively by alkaline hydrolysis of the corresponding methyl esters. The latter were obtained by reacting the 4-substituted benzaldehydes with 5-methoxycarbonylfuryltriphenylphosphonium chloride. The UV and IR spectra of products are commented. The apparent pK values of the synthesized acids were employed for calculation of the transmission coefficient π' through the benzene-furan system bridged by a -CH=CH- group.

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