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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

p-Anisaldehyde | CAS 123-11-5

A para-methoxy aromatic aldehyde used in aroma chemistry and as a component of thin-layer chromatography stains, with end-use qualification shaped by acidity, appearance and reagent formulation.

CAS123-11-5
Molecular formulaC8H8O2
Molecular weight136.15 g/mol

Product overview

p-Anisaldehyde brings together an aromatic aldehyde group and a methoxy substituent in the para position. Known also as 4-methoxybenzaldehyde, it has both sensory and laboratory reagent applications. Its role as an aroma chemical calls attention to appearance, odour and acidic components, while TLC use requires clarity about the composition of the detection reagent. CAS 123-11-5 identifies the chemical itself, not every formulated anisaldehyde staining solution. A purchasing brief should therefore state whether neat material or a prepared reagent is required. The selected grade, assay method and application-specific acceptance criteria should be agreed separately, particularly when the intended use involves food, fragrance or analytical work.

Chemical identity

Chemical name
p-Anisaldehyde
CAS number
123-11-5
Molecular formula
C8H8O2
Molecular weight
136.15 g/mol

Application context

p-Methoxybenzaldehyde is included in JECFA flavouring specifications and is associated with a sweet floral aroma. In analytical laboratories, p-anisaldehyde also serves as a component of TLC staining reagents used to reveal compounds that are not readily detected by UV observation. These are distinct uses with different qualification needs. Aroma applications may require sensory and acidity controls, while TLC work depends on reagent composition and performance with the target analytes. Neat p-anisaldehyde should not be confused with a ready-to-use stain containing other ingredients. State the intended end use so that the proposed grade and supporting documents can be evaluated accordingly.

Chemistry and synthetic role

The aldehyde remains available for carbonyl reactions, while the para methoxy group defines the electron-rich aromatic scaffold. Ortho- and meta-anisaldehyde are different positional isomers.

Quality review

Confirm para isomer and presentation

Specify neat 4-methoxybenzaldehyde or the exact composition of any solution; the two are not equivalent purchasing items.

Review acidity alongside assay

Agree acid value or a relevant related-substance method when acidic components affect the application.

Set appearance or performance criteria

For aroma use, define appropriate sensory criteria; for TLC, assess the prepared reagent with the intended analytes.

Preparing a specification

State CAS 123-11-5, neat material or solution composition, assay method, acidity and colour requirements. For flavouring or fragrance use, specify the required end-use grade and destination documentation.

Packaging and storage

Packaging, closure and net weight are agreed for the selected grade, order quantity and destination. Confirm storage and transport requirements against the actual supplier SDS.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

Is this a ready-to-use TLC stain?

This identity refers to p-anisaldehyde. A formulated stain must list its other components and concentration.

Does flavouring recognition establish the grade of a supplied batch?

The proposed batch must separately meet the agreed end-use specification and documentation requirements.

Why include acidity in an RFQ?

Acidic related components may matter to aroma quality or reagent performance and are not described fully by the name alone.

Technical sources
  1. p-Methoxybenzaldehyde, JECFA 878FAO / WHO JECFA
  2. p-Anisaldehyde A88107Sigma-Aldrich