Pyridine-4-carbaldehyde

Pyridine-4-carbaldehyde
Names
	Preferred IUPAC name Pyridine-4-carbaldehyde
	Other names 4-formylpyridine, 4-pyridinaldehyde, isonicotinaldehyde
Identifiers
CAS Number	872-85-5;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL2251606;
ChemSpider	12816;
ECHA InfoCard	100.011.666
EC Number	212-832-3;
PubChem CID	13389;
UNII	P577557492 ;
CompTox Dashboard (EPA)	DTXSID1061237 ;
	InChI InChI=1S/C6H5NO/c8-5-6-1-3-7-4-2-6/h1-5H Key: BGUWFUQJCDRPTL-UHFFFAOYSA-N;
	SMILES C1=CN=CC=C1C=O;
Properties
Chemical formula	C6H5NO
Molar mass	107.112 g·mol−1
Appearance	colorless liquid
Melting point	4 °C (39 °F; 277 K)
Boiling point	198 °C (388 °F; 471 K)
Acidity (pKa)	4.72
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H317, H319, H335
Precautionary statements	P261, P264, P271, P272, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P333+P313, P337+P313, P362, P363, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Pyridine-4-carbaldehyde is an organic compound with the formula C₅H₄NCHO. It is one of three isomeric pyridinaldehydes. The other isomers are pyridine-2-carboxaldehyde and pyridine-3-carboxaldehyde. Pyridine-4-carboxaldehyde is a colorless liquid, although aged samples can appear yellow or even brown. It undergoes many reactions expected for aromatic aldehydes such as reductive amination and Schiff base formation. It condenses with pyrrole to give tetrapyridylporphyrin. The pKa has been experimentally determined by NMR spectroscopy to be 4.72.