(Z)-11-Octadecenal

(Z)-11-Octadecenal (CAS 4273-95-4) is a C18 aldehyde used as a semiochemical component in surveillance and IPM work against Rice Leaf Folder / Rice Leaffolder and other species.

Our file records 2 targets for this material — Rice Leaf Folder / Rice Leaffolder (Cnaphalocrocis medinalis); Lesser Wax Moth (Achroia grisella) — spanning other taxa. That is why it is held for surveillance and programme work rather than as general stock.

It goes into lures and into analytical standards. The same lot can serve both, which helps when a programme needs to compare trap catches against a reference chromatogram.

Where it is used

This material sits in the working part of the catalogue: the compounds formulation teams ask for by CAS when a blend needs a specific isomer, a reference point for a chromatogram, or a small quantity to test before committing to a drum.

Isomer, stability and handling

Aldehydes are the most oxidation-sensitive class here. In practice the (E)/(Z) geometry of the double bond, not the headline assay figure, is what decides whether a blend behaves as the specification intends, so the isomer statement on the certificate is the number to read first.

Store cool, dry and dark: sealed under nitrogen or argon at −20 °C for holdings longer than one season, and let containers reach room temperature before opening so condensation does not enter the material. Weigh and formulate in a ventilated area; the safety data sheet gives handling detail for the neat substance.

Documentation and packing

Paperwork is deliberately boring: certificate of analysis with assay and isomer figures, GC trace, SDS and packing list. Nothing is quoted that cannot be reproduced on a rerun.

Standard packing for this line is 1kg / 25kg / 100kg, with smaller development quantities available so a blend can be trialled before a bulk order. Lead time is confirmed at quotation.

Specification

Product name	(Z)-11-Octadecenal
CAS number	4273-95-4
Molecular formula	C18H34O
Molecular weight	266.5 g/mol
Chemical class	Aldehyde
Function	Semiochemical component
Assay and isomeric purity	Stated per lot on the certificate of analysis
Standard packing	1kg / 25kg / 100kg
Development quantity	Available on request, below standard pack
Lead time	Confirmed at quotation
Catalogue reference	S3-4273-95-4

Target species recorded against this compound

• Rice Leaf Folder / Rice Leaffolder Cnaphalocrocis medinalis
• Lesser Wax Moth Achroia grisella

Species records are drawn from the blend literature filed for this material. Where a programme targets a species not listed, the blend is usually a ratio question rather than a different compound — send the target and we will confirm.