178042-54-1

Basic information

• Product Name: 4-hydroxybenzoate
• Synonyms: 4-hydroxybenzoate
• CAS NO: 178042-54-1
• Molecular Weight: 137.115
• Mol File: 178042-54-1.mol
• Article Data: 7

Chemical Properties

• CAS DataBase Reference: 4-hydroxybenzoate(CAS DataBase Reference)
• NIST Chemistry Reference: 4-hydroxybenzoate(178042-54-1)
• EPA Substance Registry System: 4-hydroxybenzoate(178042-54-1)

Safety Data

• Hazardous Substances Data: 178042-54-1(Hazardous Substances Data)

Upstream product

• 159700-65-9 (-)-chorismate 
• 124225-44-1 1-methyl-4-(phenylacetyl)pyridinium cation 
• 16885-71-5 C₇H₄O₃^(2-) 
• 99-96-7 4-hydroxy-benzoic acid 
• 53-86-1 [1-(4-chlorobenzoyl)-5-methoxy-2-methylindol-3-yl]acetic acid 

Downstream Products

• 124225-44-1 1-methyl-4-(phenylacetyl)pyridinium cation 
• 16885-71-5 C₇H₄O₃^(2-) 
• 99-96-7 4-hydroxy-benzoic acid 
• 206656-14-6 tricarbonylrhenium(η(5)-C5H4O2CC6H4OH) 

Relevant articles and documents

The Conformational Equilibrium of Chorismate in Solution: Implications for the Mechanism of the Non-Enzymic and the Enzyme-Catalyzed Rearrangement of Chorismate to Prephenate

The temperature variation of the 1H NMR coupling constants of chorismic acid and of the bis(tetra-n-butylammonium) salts of chorismate and of 4-O-methylchorismate in water and in methanol has been studied.The results show that 10-40percent of each of thes

A sulfate radical based ferrous-peroxydisulfate oxidative system for indomethacin degradation in aqueous solutions

The degradation of indomethacin (IM) by ferrous ion-activated potassium peroxydisulfate (Fe2+/PDS) was investigated. We aimed to determine the optimal conditions for the removal of IM under different concentrations of Fe2+and PDS, evaluate the effects of operational parameters (solution pH, humic acid (HA), N2 bubbling and persulfate species), and propose the degradation mechanism of IM by the Fe2+/PDS system. The sequential addition of Fe2+ led to an improvement in the IM degradation and TOC removal efficiency. When the molar ratio of IM/PDS/Fe2+ was 1:1.5:2, the IM was almost completely degraded. Restrictions to the degradation efficiency of IM were caused by increasing the solution pH, bubbling with nitrogen, or through the addition of HA. A low concentration of Cl- had no effect on the reaction, while a high concentration led to a dramatic inhibitory effect. In addition, quenching experiments revealed that SO4- was the major active radical for the degradation of IM by ferrous ion-activated peroxydisulfate. Based on the identification of transformation products by liquid chromatography-mass spectrometry (LC-MS/MS), the pathways of the ferrous-peroxydisulfate oxidative system for the degradation of IM were tentatively proposed.

Dissociation Constants of Weak Organic Acids in Protic Solvents Obtained from Their First Hyperpolarizabilities in Solution

The first hyperpolarizabilities (β) of some weak aromatic organic acids have been measured in protic solvents by the hyper-Rayleigh scattering (HRS) technique at low concentrations.The measured hyperpolarizability (βm) varies between the two extreme limits: the hyperpolarizability of the acid form (βHA) at the lower side and that of the basic form (βA-) at the higher side.The degree of dissociation (α) of the acid in a solvent is related to the measured hyperpolarizability, βm, by the following relationship: βm2 = (1 - α)βHA2 + αβA-2.The calculated β's including solvent effects in terms of an Onsager field do not reproduce the experimentally measured hyperpolarizabilities.Other solvent-induced effects like hydrogen bonding and van der Waals interactions seem to influence the first hyperpolarizability and, thus, indirectly the extent of dissociation of these weak acids in these protic solvents.