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Phthalaldehyde
Chemical compound / From Wikipedia, the free encyclopedia
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Phthalaldehyde (sometimes also o-phthalaldehyde or ortho-phthalaldehyde, OPA) is the chemical compound with the formula C6H4(CHO)2. It is one of three isomers of benzene dicarbaldehyde, related to phthalic acid. This pale yellow solid is a building block in the synthesis of heterocyclic compounds and a reagent in the analysis of amino acids. OPA dissolves in water solution at pH < 11.5. Its solutions degrade upon UV illumination and exposure to air.
Quick Facts Names, Identifiers ...
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Names | |
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IUPAC name
Phthalaldehyde[1] | |
Preferred IUPAC name
Benzene-1,2-dicarbaldehyde[1] | |
Other names
Benzene-1,2-dicarboxaldehyde o-Phthalaldehyde o-Phthalic dicarboxaldehyde Phthaldialdehyde | |
Identifiers | |
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3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.010.367 ![]() |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 2923 |
CompTox Dashboard (EPA) |
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Properties | |
C8H6O2 | |
Molar mass | 134.134 g·mol−1 |
Appearance | Yellow solid |
Density | 1.19 g/mL |
Melting point | 55.5–56 °C (131.9–132.8 °F; 328.6–329.1 K)[2] |
Boiling point | 266.1 °C (511.0 °F; 539.2 K) |
Low | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Toxic, Irritant |
GHS labelling: | |
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Danger | |
H228, H301, H314, H315, H317, H335, H373, H410 | |
P210, P240, P241, P260, P261, P264, P270, P271, P272, P273, P280, P301+P310, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P314, P321, P330, P332+P313, P333+P313, P362, P363, P370+P378, P391, P403+P233, P405, P501 | |
Flash point | 132 °C (270 °F; 405 K)[3] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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