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HomeProduct name list1-(5-Methyl-2-thienyl)ethan-1-one

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

  • CAS NO.:13679-74-8
  • Empirical Formula: C7H8OS
  • Molecular Weight: 140.2
  • MDL number: MFCD00014529
  • EINECS: 237-181-2
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-07-21 22:12:10
1-(5-Methyl-2-thienyl)ethan-1-one Structural

What is 1-(5-Methyl-2-thienyl)ethan-1-one?

Chemical properties

white to light yellow crystal powder

The Uses of 1-(5-Methyl-2-thienyl)ethan-1-one

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.

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.

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

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
Flash point: >230 °F
storage temp.  under inert gas (nitrogen or Argon) at 2–8 °C
form  Low Melting Crystalline Mass, Powder or Crystals
color  White to pale yellow
Specific Gravity 1.119
Odor at 1.00 % in propylene glycol. sweet spicy honey hawthorn almond acacia hyacinth caramellic graham cracker
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 for 1-(5-Methyl-2-thienyl)ethan-1-one

Signal word Warning
Pictogram(s)
ghs
Exclamation Mark
Irritant
GHS07
GHS Hazard Statements H302:Acute toxicity,oral
Precautionary Statement Codes P264:Wash hands thoroughly after handling.
P264:Wash skin thouroughly after handling.
P270:Do not eat, drink or smoke when using this product.
P330:Rinse mouth.
P501:Dispose of contents/container to..…

Computed Descriptors for 1-(5-Methyl-2-thienyl)ethan-1-one

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