4-Hydroxypyridine Chemical Properties

Melting point:

150-151 °C (lit.)

Boiling point:

230-235 °C/12 mmHg (lit.)

Density 

1.1418 (rough estimate)

refractive index 

1.5939 (estimate)

Flash point:

221 °C

storage temp. 

Keep in dark place,Inert atmosphere,Room temperature

solubility 

DMSO (Slightly), Methanol (Slightly)

form 

Powder or Chunks

pka

3.2(at 20℃)

color 

Beige to light brown

Water Solubility 

Soluble

BRN 

105800

InChIKey

GCNTZFIIOFTKIY-UHFFFAOYSA-N

LogP

-1.300 (est)

CAS DataBase Reference

626-64-2(CAS DataBase Reference)

NIST Chemistry Reference

4-Pyridinol(626-64-2)

EPA Substance Registry System

4-Pyridinol (626-64-2)

Safety Information

Hazard Codes 

Xi,Xn

Risk Statements 

36/37/38-41-37/38-22

Safety Statements 

26-36-37/39-39

WGK Germany 

3

RTECS 

UU7701450

F 

3-8-10

Hazard Note 

Harmful/Irritant

TSCA 

Yes

HazardClass 

IRRITANT

HS Code 

29339900

MSDS

• Language:English Provider:4-Hydroxypyridine
• Language:English Provider:ACROS

4-Hydroxypyridine Usage And Synthesis

Description

4-Hydroxypyridine, available from pyridylpyridinium chloride hydrochloride, is the substrate for diodone and its n-propyl ester, propyliodone. 4-Hydroxypyridine (4-HP) is a non-nucleophilic analog of the product phenol found to bind specifically to and stabilize the aminoacrylate intermediate. When 4-HP is added to Tyrosine phenol-lyase (TPL) reactions, an absorption peak at 340 nm is observed. The formation of the 340 nm peak correlates with the decay of the quinonoid intermediate peak at 505 nm, with a clean isosbestic point, and the observed rate constants show an inverse dependence on the concentration of 4-HP. These results confirm that the observed peak at 340 nm is due to the formation of the amino acrylate intermediate[1-2].

Chemical Properties

Beige crystalline powder

Uses

4-Hydroxypyridine was used in the synthesis of (Ag₃MoO₃F₃) (Ag₃MoO₄)Cl by hydro(solvato)thermal methods. It was used as model compound to study the natural photodegradation of representative aquatic environmental contaminants.

Definition

ChEBI: A monohydroxypyridine that is pyridine in which the hydrogen at position 4 has been replaced by a hydroxy group.

Purification Methods

Crystallise 4-pyridone from H2O or wet CHCl3 as the monohydrate. It loses H2O on drying in vacuo over H2SO4. Store it over KOH because it is hygroscopic.[Beilstein 21 III/IV 446, 21/7 V 152.]

References

[1] Yates, F. S. “2.09 – Pyridines and their Benzo Derivatives: (vi) Applications.”Comprehensive Heterocyclic Chemistry 2 (1984): 511-524.
[1] Robert S Phillips, Olivia Bauer. “Characterization of aminoacrylate intermediates of pyridoxal-5’-phosphate dependent enzymes.” Methods in enzymology 685 (2023): 199–224.

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