Shanghai Nianxing Industrial Co., Ltd
China
Product Name: 1-(5-Methyl-2-thienyl)ethanone
Price: Check
Purity: 96.0%
Stocking Period: 10 Day
Contact: Yang
Email: sales@echemcloud.com

Shanghai Jizhi Biochemical Technology Co., Ltd
China
Product Name: 1-(5-Methyl-2-thienyl)ethanone
Price: ￥88.0/1g ￥148.0/5g
Purity: 95.0%
Stocking Period: Inquiry
Contact: Liu jia
Email: 2130147988@qq.com

DC Chemicals Limited
China
Product Name: 2-Acetyl-5-methylthiophene
Price: $Inquiry/100mg $Inquiry/250mg $Inquiry/500mg
Purity: 98.0%
Stocking Period: 3 Day
Contact: Tony Cao
Email: sales@dcchemicals.com

Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: 2-Acetyl-5-methylthiophene
Price: $Inquiry/100g $Inquiry/1kg $Inquiry/100kg $Inquiry/1000kg
Purity: 98.0%
Stocking Period: Inquiry
Contact: Ms Wang
Email: enquiry@dycnchem.com

13679-74-8

13679-74-8 structure

13679-74-8 structure

Name: 1-(5-Methyl-2-thienyl)ethanone
Chemical Name: 2-Acetyl-5-methylthiophene
CAS Number: 13679-74-8
Molecular Formula: C₇H₈OS
Molecular Weight: 140.203
Catalog: Pharmaceutical intermediate Heterocyclic compound Thiophene compound
Create Date: 2018-07-14 17:44:02
Modify Date: 2025-08-25 19:17:49
2-Acetyl-5-methylthiophene is a constituent of coffee aroma.

Name	2-Acetyl-5-methylthiophene
Synonyms	Thiophene, 2-acetyl-5-methyl- 1-(5-Methyl-2-thienyl)ethanone 1-(5-Methyl-2-thienyl)ethanone 2-Acetyl-5-methylthiophene T5SJ BV1 E1 Ethanone, 1-(5-methyl-2-thienyl)- 1-(5-methylthien-2-yl)ethanone Methyl 5-methyl-2-thienyl ketone 1-(5-Methyl-2-thienyl)ethan-1-one 1-(5-methylthiophen-2-yl)ethanone MFCD00014529 EINECS 237-181-2 Ketone, methyl 5-methyl-2-thienyl

Density	1.1±0.1 g/cm3
Boiling Point	234.9±20.0 °C at 760 mmHg
Melting Point	24-28 °C(lit.)
Molecular Formula	C₇H₈OS
Molecular Weight	140.203
Flash Point	95.8±21.8 °C
Exact Mass	140.029587
PSA	45.31000
LogP	1.71
Vapour Pressure	0.1±0.5 mmHg at 25°C
Index of Refraction	1.536

CHEMICAL IDENTIFICATION

RTECS NUMBER :: OB4972000

CHEMICAL NAME :: Ketone, methyl 5-methyl-2-thienyl

CAS REGISTRY NUMBER :: 13679-74-8

BEILSTEIN REFERENCE NO. :: 0110854

LAST UPDATED :: 199612

DATA ITEMS CITED :: 1

MOLECULAR FORMULA :: C7-H8-O-S

MOLECULAR WEIGHT :: 140.21

WISWESSER LINE NOTATION :: T5SJ B1 EV1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 230 mg/kg

TOXIC EFFECTS :: Behavioral - convulsions or effect on seizure threshold Lungs, Thorax, or Respiration - other changes

REFERENCE :: APFRAD Annales Pharmaceutiques Francaises. (SPPIF, B.P.22, F-41353 Vineuil, France) V.1- 1943- Volume(issue)/page/year: 5,16,1947

Personal Protective Equipment	Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter
Hazard Codes	Xn: Harmful;Xi: Irritant;
Risk Phrases	R20/21/22
Safety Phrases	S36/37-S22
RIDADR	UN 3335 9
WGK Germany	3
RTECS	OB4972000
HS Code	2934999090

554-14-3 structure

554-14-3

75-36-5 structure

75-36-5

~97%

13679-74-8 structure

13679-74-8

Literature: Altenhoener, Kai; Lamm, Jan-Hendrik; Mattay, Jochen European Journal of Organic Chemistry, 2010 , # 31 p. 6033 - 6037

554-14-3 structure

554-14-3

108-24-7 structure

108-24-7

~67%

13679-74-8 structure

13679-74-8

Literature: SUMITOMO SEIKA CHEMICALS CO., LTD. Patent: EP1695972 A1, 2006 ; Location in patent: Page/Page column 7 ;

Precursor 3
554-14-3 108-24-7 75-36-5
DownStream 9
4282-31-9 1918-79-2 40323-88-4 326-72-7
4066-41-5 31555-59-6 13792-96-6 36901-17-4
70624-30-5

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

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