Цитронелол

Натуральний і синтетичнийТЕРПЕНИмонотерпеноїд · спирт · трояндового типу
Верхні ноти·Ноти серцяПіраміда
3/5Сила
—Стійкість
4Походження
Зразок
Ц
Ноти серця й верхні ноти
3,7-Dimethyloct-6-en-1-ol
Визначення

A naturally occurring monoterpenoid alcohol with a green, rosy, citrusy odour. One of the primary components of rose otto (15–40%) and geranium oil (25–45%). Common in perfumery as a building block in rose accords and fresh-floral compositions. An EU-listed allergen requiring mandatory declaration on cosmetic labels above 0.001% in leave-on products.

β-CITRONELLOL DIHYDROGERANIOL CEPHROL
Type
Молекула
Source
essential oils (rose, geranium, citronella)
Chemical class
monoterpenoid alcohol
Інструменти
Піраміда
ВВерхні ноти
СНоти серця
ББазові ноти
3/5Сила
Середня
інтенсивність запаху
Країни-виробники
Китай (синтетичне виробництво) Індія (олія герані) Єгипет (герань) Реюньйон (герань)

Запах

Opening: fresh, green-rosy, slightly citrusy. A clean floral with a transparent quality. Less dense than geraniol, less sweet than linalool.

Development: the rosy character intensifies as the green-citrus top fades. On a smelling strip, the rose quality becomes dominant after 30 minutes.

Dry-down: clean, faintly waxy, with residual green tones. Low substantivity — citronellol is among the more volatile of the common terpenoid alcohols.

Докладно

Citronellol exists as two enantiomers. (+)-Citronellol (R-form) predominates in citronella oil and has a slightly harsher, more citrusy character. (−)-Citronellol (S-form, also called rhodinol) predominates in rose otto and Bourbon geranium oil, contributing the softer, rosy quality. Commercial citronellol is usually a racemic mixture or enriched in one enantiomer depending on the source.

In nature, citronellol occurs at significant concentrations in Rosa damascena (15–40% of the essential oil), Pelargonium graveolens (geranium, 25–45%), and Cymbopogon nardus (citronella, 5–15%). It is also found in smaller quantities in lemongrass, eucalyptus citriodora, and certain basil chemotypes.

Industrial production uses either isolation from natural oils (primarily Bourbon geranium) or catalytic hydrogenation of geraniol or nerol. Synthetic citronellol is chemically identical to the natural molecule.

Citronellol is classified as a fragrance allergen under EU Cosmetic Regulation (EC) No 1223/2009 and must be declared on ingredient labels when present above threshold concentrations (0.001% in leave-on products, 0.01% in rinse-off). This does not prohibit its use — it requires transparency.

Отримання й хімія

Формула
C₁₀H₂₀O
CAS
106-22-9
Ботанічна назва
3,7-Dimethyloct-6-en-1-ol
Зовнішній вигляд
Colourless to pale yellow liquid
Сила запаху
Середня
Синоніми
β-CITRONELLOL DIHYDROGERANIOL CEPHROL
Статус IFRA
Обмежено

EU allergen — declaration required above 0.001% (leave-on) / 0.01% (rinse-off)

У парфумерії

Citronellol is a workhorse in rose reconstruction. It provides the fresh, green-rosy top of a rose accord, complementing geraniol (which provides the sweeter, honeyed quality) and phenylethyl alcohol (which contributes the heavier, deeper rose petal quality). Used extensively in fresh florals, green compositions, and as a natural modifier to add transparency to heavier bases. Annual global consumption in fragrance exceeds 3,000 tonnes.

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