10234-03-4

Basic information

• Product Name: Benzenesulfonic acid, 4-methoxy-, potassium salt
• CAS NO: 10234-03-4
• Molecular Formula: C7H8O4S.K
• Molecular Weight: 226.294
• Mol File: 10234-03-4.mol
• Article Data: 4

Chemical Properties

• CAS DataBase Reference: Benzenesulfonic acid, 4-methoxy-, potassium salt(CAS DataBase Reference)
• NIST Chemistry Reference: Benzenesulfonic acid, 4-methoxy-, potassium salt(10234-03-4)
• EPA Substance Registry System: Benzenesulfonic acid, 4-methoxy-, potassium salt(10234-03-4)

Safety Data

• Hazardous Substances Data: 10234-03-4(Hazardous Substances Data)

Upstream product

• 31367-69-8 potassium p-tolylthiolate 
• 100-66-3 methoxybenzene 
• 56830-32-1 potassium p-methoxybenzene thiolate 
• 6214-19-3 methyl p-methoxybenzenesulfonate 
• 89690-47-1 potassium 3,4-dichlorobenzenesulfonate 

Downstream Products

• 46506-54-1 4-methoxy-benzene-1,3-disulfonic acid 
• 6214-19-3 methyl p-methoxybenzenesulfonate 
• 89690-47-1 potassium 3,4-dichlorobenzenesulfonate 

Relevant articles and documents

Sulfonation of anisole, phenol, toluene and related alkyl and alkoxy derivatives with SO3. The influence of the solvent system on the reactivity and the sulfonic acid product distribution

The reactions of anisole (1), phenol (2), the alkoxy- and alkylphenyl ethers 3-11, toluene (12) and the o-dialkylbenzenes 13-15 with sulfur trioxide in dichloromethane or trichlorofluoromethane have been studied.Our results have been compared with those obtained with the same substrates upon reaction with SO3 in nitromethane and dioxane.We show that ortho substitution is enhanced for sterically unhindered phenyl ethers and phenols due to complex formation between SO3 and the C(sp2)-bonded oxygen when dichloromethane is used as solvent instead of nitromethane or dioxane.This is mainly as a result of intramolecular SO3 transfer from the oxygen to the ortho carbon and subsequent conversion of the resulting ?-complex into the ortho sulfonic acid.

Solutes in sulfuric acid. Part VIII. Protonation of phenol, 4-fluorophenol and the 2- and 4-sulfonates of anisole and phenol in concentrated aqueous sulfuric acid; determination of pKa values by means of 13C NMR

The protonation of phenol (2), 4-fluorophenol (3), phenyl methanesulfonate, potassium phenyl sulfate and the potassium 2- and -4-sulfonates of both phenol and anisole in concentrated aqueous sulfuric acid at 30 deg C has been investigated using 13C NMR spectroscopy.The results show that phenol and 4-fluorophenol are protonated predominantly on the oxygen atom.This protonation is governed by the Hoa acidity function.The pKa of the oxonium ions of 2 and 3 are -6.40 +/- 0.05 and -6.41 +/- 0.05, respectively.The protonation of phenyl methanesulfonate occurs at acid concentrations > 100percent.Potassium phenyl sulfate in >/= 20percent H2SO4 hydrolyses very rapidly to give phenol.The 2- and 4-sulfonates of both phenol and anisole are protonated on both the -OR (R = H, Me) and the SO3- groups; the sulfuric acid concentrations of half-protonation have been determined to be between 80.0 and 83.3percent H2SO4, corresponding with pKa's of the conjugate acids between -6.34 and -6.66 based on the Hoa scale.