4-Anisaldehyde, or p-Anisaldehyde, is an organic compound with the formula CH3OC6H4CHO. The molecule consists of a benzene ring with a formyl and a methoxy group. It is a colorless liquid with a strong aroma. It provides sweet, floral and strong aniseed odor. Two isomers of 4-anisaldehyde are known, ortho-anisaldehyde and meta-anisaldehyde. They are less commonly encountered.
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Names | |||
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Preferred IUPAC name
4-Methoxybenzaldehyde | |||
Systematic IUPAC name
4-Methoxybenzenecarbaldehyde | |||
Other names
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Identifiers | |||
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3D model (JSmol)
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ChEBI |
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ChEMBL |
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ChemSpider |
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ECHA InfoCard | 100.004.185 | ||
EC Number |
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KEGG |
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PubChem CID
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UNII |
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CompTox Dashboard (EPA)
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Properties | |||
C8H8O2 | |||
Molar mass | 136.150 g·mol−1 | ||
Density | 1.119 g/cm3[2] | ||
Melting point | −1 °C (30 °F; 272 K)[2] | ||
Boiling point | 248 °C (478 °F; 521 K)[2] | ||
Hazards | |||
GHS labelling: | |||
Warning | |||
H302 | |||
P264, P270, P301+P312, P330, P501 | |||
Flash point | 108 °C (226 °F; 381 K) | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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Anisaldehyde is prepared commercially by oxidation of 4-methoxytoluene (p-cresyl methyl ether) using manganese dioxide to convert a methyl group to the aldehyde group. It can also be produced by oxidation of anethole, a related fragrance that is found in some alcoholic beverages, by oxidative cleavage of an alkene.[3]
Being structurally related to vanillin, 4-anisaldehyde is a widely used in the fragrance and flavor industry.[3] It is used as an intermediate in the synthesis of other compounds important in pharmaceuticals and perfumery. The related ortho isomer has a scent of licorice.
A solution of para-anisaldehyde in acid and ethanol is a useful stain in thin layer chromatography.[4] Different chemical compounds on the plate can give different colors, allowing easy distinction.
Anisaldehyde in combination with copper (II) can induce single- and double-strand breaks in double stranded DNA.[5]