1-(5-Methyl-2-thienyl)ethan-1-on

Bezeichnung:1-(5-Methyl-2-thienyl)ethan-1-on

CAS-Nr13679-74-8

Englisch Name:1-(5-Methyl-2-thienyl)ethan-1-one

CBNumberCB8245960

SummenformelC7H8OS

Molgewicht140.2

MOL-Datei13679-74-8.mol

Synonyma

1-(5-Methyl-2-thienyl)ethan-1-on

1-(5-Methyl-2-thienyl)ethan-1-on physikalisch-chemischer Eigenschaften

Schmelzpunkt	24-28 °C(lit.)
Siedepunkt	65-67 °C1 mm Hg(lit.)
Dichte	1.106 g/mL at 25 °C(lit.)
FEMA	4643 \| 2-ACETYL-5-METHYLTHIOPHENE
Brechungsindex	n20/D 1.561(lit.)
Flammpunkt	>230 °F
storage temp.	under inert gas (nitrogen or Argon) at 2–8 °C
Aggregatzustand	Low Melting Crystalline Mass, Powder or Crystals
Wichte	1.119
Farbe	White to pale yellow
Geruch (Odor)	at 1.00 % in propylene glycol. sweet spicy honey hawthorn almond acacia hyacinth caramellic graham cracker
Geruchsart	spicy
Sensitive	Light Sensitive
JECFA Number	2107
BRN	110854
LogP	2.04
CAS Datenbank	13679-74-8(CAS DataBase Reference)
NIST chemische Informationen	2-Acetyl-5-methylthiophene(13679-74-8)

Sicherheit

Kennzeichnung gefährlicher	Xn,Xi
R-Sätze:	20/21/22
S-Sätze:	36/37-22
RIDADR	UN 3335
WGK Germany	3
RTECS-Nr.	OB4972000
Hazard Note	Irritant
HazardClass	STENCH
HS Code	29349990

Gefahreninformationscode (GHS)

1-(5-Methyl-2-thienyl)ethan-1-one Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R20/21/22:Gesundheitsschädlich beim Einatmen,Verschlucken und Berührung mit der Haut.
S-Sätze Betriebsanweisung:
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
S22:Staub nicht einatmen.
Chemische Eigenschaften
white to light yellow crystal powder
Verwenden
2-Acetyl-5-methylthiophene may be used in the preparation of:
- 2-ethyl-5-methylthiophene
- (5-methylthiophen-2-yl)glyoxal
- (2E)-1-(5-methylthiophen-2-yl)-3-(pyridin-3-yl)prop-2-en-1-one
- ethyl 3-(5-methylthiophen-2-yl)-3-oxopropanoate
Definition
ChEBI: 2-acetyl-5-methylthiophene is a thiophene that is substituted by acetyl and methyl groups at positions 2 and 5, respectively. It has a role as a flavouring agent. It is an aromatic ketone, a member of thiophenes and a methyl ketone.
Allgemeine Beschreibung
2-Acetyl-5-methylthiophene is a volatile organic compound formed during the reaction between L-cysteine and dihydroxyacetone in glycerine or triglyceride solvent system. It can be prepared by reacting 2-methylthiophene with acetic anhydride. 2-Acetyl-5-methylthiophene undergoes palladium-catalyzed cross-coupling reaction with aryl bromides to form C-4 arylated product. It reacts with 1,2-bis(5-formyl-2-methylthiophen-3-yl)cyclopentene via Aldol condensation to form a chalcone with photochromic property. The standard molar enthalpies of combustion, formation and vaporization of 2-acetyl-5-methylthiophene are 4341.9 ± 1.8kJ/mol, 158.0 ± 2.1kJ/mol and 62.0 ± 2.6kJ/mol, respectively.
Sicherheitsprofil
A poison by intraperitoneal route. A flammable liquid. When heated to decomposition it emits toxic vapors of SOx.

1-(5-Methyl-2-thienyl)ethan-1-one Upstream-Materialien And Downstream Produkte

1-(5-Methyl-2-thienyl)ethan-1-on Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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