Description and usage notes:
Sweet floral perfume-like notes with green citrus and melon undertones, regarded by most perfumers as the closest one-molecule match to the scent of lily of the valley flowers. A more detailed description of the odour character and uses of this aldehyde is offered in the entry for the pure material.
NOTE: offered here with the addition of 25% hydroxycitronellol to stabilise the aldehyde avoiding problems with oxidation that are otherwise significant. Blending of the two materials is done by Pell Wall and this is the form in which hydroxycitronellal is used in our own work.
The odour profile is almost identical with hydroxycitronellal alone with some additional fixation; the mixture forms a hemi-acetal as described by Bedoukian:
and then later in the same chapter:
“When aldehydes are added to alcohols, a reaction often takes place as evidenced by a rise in temperature, changes in refractive indices, and other physical changes which result from the formation of hemiacetals.”
he goes on to explain that as hydroxycitronellal has both aldehyde and alcohol groups it could be forming an internal hemi-acetal, but experimental evidence shows this is not the case. Finally he expands and gives details of the proper proportions: