Product

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

CAS No.：13679-74-8

Other grades of this product :

1-(5-Methyl-2-thienyl)ethan-1-one Basic information

Product Name:	1-(5-Methyl-2-thienyl)ethan-1-one
Synonyms:	1-(5-methyl-2-thiophenyl)ethanone;1-(5-methyl-2-thienyl)ethan-1-one;2-Acetyl-5-Methylthiophene, 98% 25GR;1-(5-methyl-2-thienyl)-ethanon;1-(5-Methyl-2-thienyl)ethanone;1-(5-Methyl-thiophen-2-yl)-ethanone;5-Methyl-2-acetylthiophene;Ethanone, 1-(5-methyl-2-thienyl)-
CAS:	13679-74-8
MF:	C7H8OS
MW:	140.2
EINECS:	237-181-2
Product Categories:	Building Blocks;Heterocyclic Building Blocks;Thiophene&Benzothiophene;Thiophens;Thiophenes
Mol File:	13679-74-8.mol

1-(5-Methyl-2-thienyl)ethan-1-one Chemical Properties

Melting point	24-28 °C(lit.)
Boiling point	65-67 °C1 mm Hg(lit.)
density	1.106 g/mL at 25 °C(lit.)
refractive index	n20/D 1.561(lit.)
FEMA	4643 \| 2-ACETYL-5-METHYLTHIOPHENE
Fp	>230 °F
storage temp.	under inert gas (nitrogen or Argon) at 2–8 °C
form	Low Melting Crystalline Mass, Powder or Crystals
Specific Gravity	1.119
color	White to pale yellow
Sensitive	Light Sensitive
JECFA Number	2107
BRN	110854
CAS DataBase Reference	13679-74-8(CAS DataBase Reference)
NIST Chemistry Reference	2-Acetyl-5-methylthiophene(13679-74-8)

Safety Information

Hazard Codes	Xn,Xi
Risk Statements	20/21/22
Safety Statements	36/37-22
RIDADR	UN 3335
WGK Germany	3
RTECS	OB4972000
Hazard Note	Irritant
HazardClass	STENCH
HS Code	29349990

MSDS Information

Provider	Language
1-(5-Methyl-2-thienyl)ethan-1-one	English
SigmaAldrich	English
ACROS	English
ALFA	English

1-(5-Methyl-2-thienyl)ethan-1-one Usage And Synthesis

Chemical Properties	white to light yellow crystal powder
Uses	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
General Description	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.
Safety Profile	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 Preparation Products And Raw materials

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