Benzene dicarboxylic acids

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Benzene dicarboxylic acids
Surname 1,2-benzene dicarboxylic acid 1,3-benzene dicarboxylic acid 1,4-benzenedicarboxylic acid
other names o -Benzene dicarboxylic
acid phthalic acid 		m -Benzenedicarboxylic
acid isophthalic acid 		p -Benzenedicarboxylic
acid terephthalic acid
Structural formula Phthalic acid Isophthalic acid Terephthalic acid
CAS number 88-99-3 121-91-5 100-21-0
PubChem 1017 8496 7489
ECHA InfoCard 100.001.703 100.004.098 100.002.573
Molecular formula C 8 H 6 O 4
Molar mass 166.13 g mol −1
Physical state firmly
Brief description white crystalline solids
Melting point 191 ° C 346 ° C
Sublimation point 402 ° C
pK s 1 value 2.95 3.62 3.54
pK s 2 value 5.41 4.60 4.46
Solubility
in water 		1.4 g l −1 (25 ° C) 0.12 g l −1 (25 ° C) 15 mg l −1 (20 ° C)
GHS
labeling
07 - Warning
Caution
no GHS pictograms
no GHS pictograms
H and P phrases 315-319-335 no H-phrases no H-phrases
no EUH phrases no EUH phrases no EUH phrases
261-280-305 + 351 + 338
304 + 340-405-501 		no P-phrases no P-phrases

The benzene dicarboxylic acids form a group of substances consisting of a benzene ring with two attached carboxy groups  (-COOH). Their different arrangements ( ortho , meta or para ) result in three positional isomers with the empirical formula C 8 H 6 O 4 .

See also

Individual evidence

  1. ↑ a b c Entry on phthalic acid in the GESTIS substance database of the IFA , accessed on March 14, 2017(JavaScript required) .
  2. ↑ a b c Entry on isophthalic acid in the GESTIS substance database of the IFA , accessed on July 9, 2020(JavaScript required) .
  3. ↑ a b c Entry on terephthalic acid in the GESTIS substance database of the IFA , accessed on March 14, 2017(JavaScript required) .
  4. ↑ a b CRC Handbook of Tables for Organic Compound Identification , Third Edition, 1984, ISBN 0-8493-0303-6 .

Web links

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