7-Hydroxycitronellal

Gefahreninformationscode (GHS)

• Bildanzeige (GHS)

  

• Alarmwort

  Warnung

• Gefahrenhinweise

  H315：Verursacht Hautreizungen.

  H317：Kann allergische Hautreaktionen verursachen.

  H319：Verursacht schwere Augenreizung.

• Sicherheit

  P280：Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.

  P302+P352：BEI BERÜHRUNG MIT DER HAUT: Mit viel Wasser/... (Hersteller kann, falls zweckmäßig, ein Reinigungsmittel angeben oder, wenn Wasser eindeutig ungeeignet ist, ein alternatives Mittel empfehlen) waschen.

  P305+P351+P338：BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.

3,7-Dimethyl-7-hydroxyoctanal Chemische Eigenschaften,Einsatz,Produktion Methoden

• R-Sätze Betriebsanweisung:

  R38:Reizt die Haut.
  R41:Gefahr ernster Augenschäden.

• S-Sätze Betriebsanweisung:

  S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
  S39:Schutzbrille/Gesichtsschutz tragen.

• Beschreibung

  Hydroxycitronellal has an intense, sweet, floral, lily-type odor. It may be prepared by hydration of natural citronellal obtained from Java citronella or from Eucalyptus citriodora; P-pinene is converted to myrcene, which on hydration may yield either linalool or a mixture of geranoil and nerol; the latter mixture can be hydrogenated to citronellol and subsequently converted to citronellal and hydroxycitronellal; also by hydrogenation of 3,7-dimethyl- 7-hydroxy-2-octen-2-al over palladium carbon in ethyl acetate solution.

• Chemische Eigenschaften

  This is a colorless, slightly viscous liquid with a floral odor reminiscent of linden blossom and lily of the valley. Commercially available “hydroxycitronellal” is either optically active or racemic, depending on the starting material used. Hydroxydihydrocitronellal prepared from (+)-citronellal, for example, has a specific relation α20 D +9 to +10°.
  Hydroxydihydrocitronellal is relatively unstable toward acid and alkali and is, therefore, sometimes converted into more alkali-resistant acetals, particularly its dimethyl acetal.
  Because of its fine, floral odor, hydroxydihydrocitronellal is used in large quantities in many perfume compositions for creating linden blossom and lily of the valley notes. It is also used in other blossom fragrances such as honeysuckle, lily, and cyclamen.

• Chemische Eigenschaften

  clear colourless liquid

• Chemische Eigenschaften

  Hydroxycitronellal has a sweet, floral, lily-type odor

• Occurrence

  Reported found in pepper

• Verwenden

  Hydroxycitronellal is a fragrance for use in various perfumes, antiseptics, insecticides and household products; some perfumery uses (sweet pea Pois De Senteur; gardenia; cherry; melon; mint).

• Verwenden

  7-Hydroxycitronellal shows fungicide activity the strains of Candida tropicalis.

• synthetische

  The most important synthetic routes to hydroxydihydrocitronellal are listed as follows.
  1) Synthesis from citronellal: One of the oldest routes to hydroxydihydrocitronellal is the hydration of the citronellal bisulfite adduct (obtained at low temperature) with sulfuric acid, followed by decomposition with sodium carbonate. A more recent development is hydration of citronellal enamines or imines, followed by hydrolysis.
  2) Synthesis from citronellol. Citronellol is hydrated to 3,7-dimethyloctane-1,7- diol, for example, by reaction with 60% sulfuric acid. The diol is dehydrogenated catalytically in the vapor phase at low pressure to give highly pure hydroxydihydrocitronellal in excellent yield.The process is carried out in the presence of, for example, a copper–zinc catalyst; at atmospheric pressure, noble metal catalysts can also be used.
  3) Synthesis from 7-hydroxygeranyl/-neryl dialkylamine: The starting material can be obtained by treatment of myrcene with a dialkylamine in the presence of an alkali dialkylamide, followed by hydration with sulfuric acid. The 7-hydroxygeranyl/-neryl dialkylamine isomerizes to the corresponding 7-hydroxyaldehyde enamine in the presence of a palladium(II)- phosphine complex as catalyst. Hydrolysis of the enamine gives 7-hydroxydihydrocitronellal [151].

• Definition

  ChEBI: The tertiary alcohol arising from addition of water across the C2C double bond of citronellal.

• Taste threshold values

  Taste characteristics at 50 ppm: sweet, waxy, green, floral and melon notes.

• Flammability and Explosibility

  Not classified

• Handelsname

  Laurinal® (Takasago).

• Kontakt-Allergie

  Hydroxycitronellal is a classical fragrance allergen, found in many products. It is contained in “fragrance mix.” It has to be listed by name in the cosmetics of the EU.

• Sicherheitsprofil

  A skin irritant. Combustible liquid. When heated to decomposition it emits acrid smoke and irritating fumes. See also ALDEHYDES.

• Synthese

  By hydration of natural citronellal obtained from Java citronella or from Eucalyptus citriodora; β-pinene is converted to myrcene, which on hydration may yield either linalool or mixture of geranoil and nerol; the latter mixture can be hydrogenated to citronellol and subsequently converted to citronellal and hydroxycitronellal; also by hydrogenation of 3,7-dimethyl-7-hydroxy-2- octen-2-al over palladium carbon in ethyl acetate solution.

3,7-Dimethyl-7-hydroxyoctanal Upstream-Materialien And Downstream Produkte

7-Hydroxycitronellal Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global(253)Suppliers

107-75-5, 3,7-Dimethyl-7-hydroxyoctanal Verwandte Suche: