A softer, rounder version of undecanal — waxy, fatty-aldehydic with a mellow orange peel facet. The dimethylacetal form is milder and less pungent than the free aldehyde, contributing a fresh, slightly citrusy, clean-laundry effect with better stability in alkaline bases.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 1354.
Colorless liquid.
Almost insoluble in water, soluble in alcohol and oils.
Fresh, oily-floral, citrusy odor with mildly herbaceous-green notes and moderate tenacity.
This acetal is occasionally used in perfume compositions as a modifier for the aldehyde, mellowing and extending its effect into a wider field, beyond the topnote, where the aldehyde almost inevitably works.
Produced from Undecanal and Methanol, usually with dry hydrogen chloride as condensing agent, or with Ferrichloride or similar catalyst.