Ácido hidroxibenzenossulfônico

Ácido hidroxibenzenossulfônico ou ácido fenolsulfônico são um grupo de compostos orgânicos que são formados por um anel benzeno com um grupo hidróxi (-OH), caracterizando um fenol, e um grupo sulfônico (–SO2OH), como substituintes. Devido a seus diferentes arranjos, tem-se três isômeros com a fórmula C6H6O4S.

Ácido fenolsulfônico
Nome Ácido 2-hidroxibenzenossulfônico Ácido 3-hidroxibenzenossulfônico Ácido 4-hidroxibenzenossulfônico
Outros nomes Ácido o-fenolsulfônico
Ácido 2-fenolsulfônico
 Ácido m-fenolsulfônico
Ácido 3-fenolsulfônico
  		Ácido p-fenolsulfônico
Ácido 4-fenolsulfônico
 
Fórmula estrutural
Número CAS 609-46-1 585-38-6 98-67-9
PubChem PubChem 11867 PubChem 11451 PubChem 4765
Fórmula química C6H6O4S
Massa molar 174,18 g·mol−1
Estado físico sólido sólido
Aparência sólido amarelado agulhas cristalinas incolores
Ponto de fusão 145 °C (decomposição)[1] ~0 °C (sob forma comercial)[2]
Ponto de ebulição ~100 °C (sob forma comercial)[2]
Solubilidade solúvel em água solúvel em água[2]
Identificação
no sistema GHS 		nenhuma
classificação
disponível 		nenhuma
classificação
disponível
Corrosivo e Nocivo[3]
Advertências de
perigo GHS 		sem advertência sem advertência 314 - 341
ver acima ver acima ver acima
ver acima ver acima 280 305+351+338 310
Informações de
perigosos
[2] 		nenhuma
classificação
disponível		 nenhuma
classificação
disponível
Frases R veja acima veja acima 34
Frases S veja acima veja acima 26|36/37/39|45

Propriedades

Os ácido fenolsulfônico apresentam-se como sólidos ou líquidos incolores a amareladas.

Produção

Ácido 2-fenolsulfónico e ácido 4-fenolsulfónico podem ser preparados por sulfonação do fenol com ácido sulfúrico concentrado e são recuperados de uma mistura na qual os dois surgem como produtos. Uma sulfonação vigorosa do fenol dá como resultado o ácido fenol-2,4-dissulfônico.[4]

Referências

  1. ↑ David R. Lide, George W. A. Milne, Handbook of Data on Common Organic Compounds, ISBN 0-8493-0404-0.
  2. ↑ a b c d Registo de CAS RN 98-67-9 na Base de Dados de Substâncias GESTIS do IFA.
  3. ↑ Catálogo da Sigma-Aldrich, Ácido hidroxibenzenossulfônico 
  4. ↑ Beyer / Walter: Lehrbuch der Organischen Chemie, 19. Auflage, S. Hirzel Verlag, Stuttgart 1981, ISBN 3-7776-0356-2, S. 467.

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