Пара-цимен
Para-cymene is a naturally occurring aromatic organic compound, an alkylbenzene related to monocyclic monoterpenes. Its odor is mild and pleasant, and when pure it has a weak citrus odor.
- Type
- Складник
- Olfactive family
- Ароматичні
- Source
- essential oils (cumin, thyme)
- Chemical class
- aromatic hydrocarbon (alkylbenzene related to monocyclic monoterpenes)
Запах
Докладно
Отримання й хімія
Спосіб отримання
p-Cymene is prepared by alkylation of toluene with propylene. Various Lewis acids, such as aluminium trichloride, catalyze these alkylations. Terpenes such as alpha-pinene, beta-pinene and limonene are converted to cymenes by contact with an alkali metal carbonate catalyst on a support at 300 to 475 °C. Significant amounts of cymene are formed from wood terpenes in the sulfite pulping process.
- Формула
- C₁₀H₁₄
- CAS
- 99-87-6
- Ботанічна назва
- Cuminum cyminum (cumin)
- Зовнішній вигляд
- colorless to pale yellow mobile liquid
- Сила запаху
- Висока
- Синоніми
- p-cymene, 4-isopropyltoluene, 4-methylcumene, p-cymol, p-isopropyltoluene, paracymene
No IFRA Standard for the material itself (51st Amendment)
- Температура кипіння
- 177 °C
- Температура плавлення
- -68.9 °C
- Температура спалаху
- 47 °C (117 °F)
- Відносна густина
- 0.857 at 68 °F
- Показник заломлення
- 1.4908 at 20 °C
У парфумерії
Cumin oil, whose major volatile components include cymene, is used for a variety of flavors and perfumes.