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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Methyl 4-formylbenzoate | CAS 1571-08-0

A para-substituted aromatic building block pairing an aldehyde with a methyl ester, allowing benzylamine-side-chain construction while retaining a separate carboxyl-derived function for later elaboration.

CAS1571-08-0
Molecular formulaC9H8O3
Molecular weight164.16 g/mol

Product overview

Methyl 4-formylbenzoate places two different carbonyl functions on opposite sides of a benzene ring. The aldehyde can participate in carbonyl addition or imine-related chemistry, while the methyl ester provides a distinct carboxyl-derived site. Published patent chemistry uses the aldehyde in reductive amination before subsequent transformation of the ester-containing intermediate. CAS 1571-08-0 identifies this bifunctional molecule, also known as methyl terephthalaldehydate. It should not be confused with terephthalaldehyde, which has two aldehydes, or dimethyl terephthalate, which has two esters. Qualification should verify both functions and the para substitution pattern, then assess aldehyde-related impurities that may respond differently in the intended reaction.

Chemical identity

Chemical name
Methyl 4-formylbenzoate
CAS number
1571-08-0
Molecular formula
C9H8O3
Molecular weight
164.16 g/mol

Application context

A published patent sequence uses methyl 4-formylbenzoate in reductive amination to construct an aminomethyl-substituted aromatic ester. Subsequent steps elaborate the intermediate and transform the ester-derived functionality. This is an example of staged use of the molecule: the aldehyde establishes a benzyl linkage, while the methyl ester remains available for later chemistry. In route development, the benefit is the presence of two chemically distinct handles within a para-disubstituted aryl fragment. For procurement, define the required intact aldehyde and ester composition and review reduced, oxidized or hydrolysed relatives when they are relevant to the proposed manufacturing route.

Chemistry and synthetic role

The structure is OHC–C6H4–COOCH3 with a 1,4 relationship. One carbonyl is an aldehyde and the other is an ester; this is not a dialdehyde.

Quality review

Verify both carbonyl functions

Confirm a formyl group and methyl ester rather than a dialdehyde, diester or free acid.

Resolve para and related structures

Use identity data and chromatography appropriate for the specified substitution pattern.

Review aldehyde-related changes

Consider the corresponding benzyl alcohol, oxidized acid or ester hydrolysis products when relevant to the source and use.

Preparing a specification

Specify CAS 1571-08-0, methyl ester and para-formyl identity, chromatographic assay and limits for relevant alcohol, acid or hydrolysed species. State water requirements for the intended carbonyl reaction.

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

Does the molecule have two aldehyde groups?

No. It contains one aldehyde and one methyl ester.

What is methyl terephthalaldehydate?

It is a synonym for methyl 4-formylbenzoate.

Why verify the ester if the first step uses the aldehyde?

The ester may be needed intact for a later transformation in the sequence.

Technical sources
  1. Methyl terephthalaldehydate T0012TCI
  2. Philippine Inventory of Chemicals 2017Environmental Management Bureau, Philippines
  3. EP2991982B1, reaction scheme 1 paragraph 0050European Patent Office