O-phthalaldehyde, pale yellow crystals, sensitive to light and air, can volatilize with water vapor. It is soluble in water, ethanol, ether and organic solvents, slightly soluble in petroleum ether.



CAS NO: 643-79-8

Molecular formula: C8H6O2

Appearance: Yellow or green powder

Purity: ≥98 %

Molecular weight: 134.13

Einecs No.: 211-402-2



Test ItemStandard
AppearanceYellow or green powder
Purity  98.52%
Melting Point56℃
Boiling point83-84℃


Use Of O-Phthalaldehyde:   

  1. Analytical reagents in the chemical field: as amine alkaloid reagents, used to determine primary amines and peptide bond decomposition products by fluorescence method.
  2. Organic synthesis: It is also a pharmaceutical intermediate.
  3. Fluorescent reagents are used for the separation of amino acid derivatives by pre-column HPLC, and the thiol groups of proteins are measured by flow cytometry.


Package of O-Phthalaldehyde:



Storage: Stored in a dry, ventilated environment.