(Z)-11-Octadecenal

CAS 4273-95-4, (Z)-11-Octadecenal, carries an aldehyde handle on a C18H34O skeleton and weighs 266.5 g/mol.

Condensation chemistry starts here. The alpha hydrogens are acidic enough for enamine and enolate work, and the carbonyl itself takes the nucleophile. The name fixes the geometry at C11, so the entry is a defined isomer rather than a mixture and the lot is qualified on that isomer.

The formula C18H34O resolves to 18 carbons with one oxygen. With 18 carbons the lipophilicity dominates: solubility in polar media falls away and the work-up is usually a phase separation.

Handling and storage

Store cold, closed and away from oxidants; the acid that forms on air exposure is the impurity to watch on an older lot.

Ordering

Quoted from stock in 1kg / 25kg / 100kg, or made to order where the lot has run down. Either way the same release testing applies. Identity is confirmed by NMR and MS at release, and the assay value belongs to the lot rather than to the catalogue entry.

Registry synonyms: Cnaphalocrocis medinalis(Rice Leaf Folder / Rice Leaffolder); Achroia grisella(Lesser Wax Moth); Cnaphalocrocis medinalis.