Is 2-Methyldecanal interchangeable with undecanal because both have the formula C11H22O?

No. 2-Methyldecanal is a branched aldehyde, while undecanal is the straight-chain positional isomer. They may differ in odor profile, chromatographic retention and reaction behavior. Confirm the named structure, CAS number, GC identity method and impurity profile rather than matching molecular formula alone.

Does CAS 19009-56-4 define one enantiomer of 2-Methyldecanal?

No. Carbon-2 is stereogenic, but a CAS listing without an R or S designation does not establish enantiomeric composition. If odor character, reaction selectivity or a regulated specification depends on stereochemistry, state the required form and chiral method; otherwise define acceptance by identity, GC assay and impurity profile.

2-Methyldecanal CAS 19009-56-4

2-Methyldecanal , identified by CAS No. 19009-56-4 and EC No. 242-745-6 , is a C11 branched aldehyde used in fragrance and flavor-development work. Its molecular formula is C11H22O . Commercial acceptance should be based on the offered grade's identity, assay, acid value, odor profile, color and stability rather than an unsupported universal purity or performance claim. Buyers should review the current COA and SDS and evaluate a sample in the intended base.

CAS: 19009-56-4
Synonyms: 2-Methyldecanal, Decanal, 2-methyl-, alpha-Methyldecanal, Methyloctylacetaldehyde
Einecs: 242-745-6
Molecular Formula: C₁₁H₂₂O
Grade: For fragrance or formulation evaluation, confirm identity, GC assay, isomer and oxidation profile, odor or color criteria and supporting documents; no fragrance grade is assumed.
Package: State required quantity and destination; confirm the current container, light or moisture protection, net weight, storage conditions and transport requirements against the current COA and SDS.

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Product Description

1 Identity and physicochemical profile

2 Applications and grade selection

3 Storage and handling

4 Safety, documentation and procurement

Identity and physicochemical profile

Item	Technical guidance
Product identity	2-Methyldecanal; decanal, 2-methyl-
CAS / EC	19009-56-4 / 242-745-6
Formula / molecular weight	C₁₁H₂₂O / 170.29 g/mol
Physical character	Liquid aldehyde; color and odor acceptance limits are grade-specific
Key quality controls	Identity, assay, acid value, color, odor profile and supplier-defined impurity limits
Use boundary	Fragrance supply does not automatically establish food-use authorization, IFRA conformity or suitability for every market

Applications and grade selection

2-Methyldecanal is evaluated as an aldehydic fragrance or flavor-development ingredient where a dry, waxy or citrus-related note is desired. Performance can change with dose, base composition, pH, antioxidants, packaging and storage conditions, so descriptive odor language should be treated as guidance rather than a release specification.

Compare a candidate sample against the approved reference in the finished soap, detergent, fabric-care, fine-fragrance or other intended base.
Check odor quality, diffusion, discoloration, acid-value development and stability under the actual processing and storage conditions.
For regulated fragrance or flavor use, request the documents required for the destination market and confirm the exact scope with the formulator’s regulatory team.

Storage and handling

Keep the original container tightly closed in a cool, dry, ventilated area away from heat, light and incompatible oxidizing materials. Minimize unnecessary air exposure and follow the supplied TDS or SDS for any inert-gas, temperature or shelf-life requirement.

Safety, documentation and procurement

Handle according to the current SDS using suitable gloves, eye protection and ventilation. A quotation request should state the application, assay and odor criteria, reference sample if applicable, trial quantity, annual demand, package, destination and required regulatory statements.

FAQ - Technical & Supply Chain

Q:
Is 2-Methyldecanal interchangeable with undecanal because both have the formula C11H22O?

A: No. 2-Methyldecanal is a branched aldehyde, while undecanal is the straight-chain positional isomer. They may differ in odor profile, chromatographic retention and reaction behavior. Confirm the named structure, CAS number, GC identity method and impurity profile rather than matching molecular formula alone.
Q:
Does CAS 19009-56-4 define one enantiomer of 2-Methyldecanal?

A: No. Carbon-2 is stereogenic, but a CAS listing without an R or S designation does not establish enantiomeric composition. If odor character, reaction selectivity or a regulated specification depends on stereochemistry, state the required form and chiral method; otherwise define acceptance by identity, GC assay and impurity profile.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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