Ethyl 5-bromothiophene-3-carboxylate

CAS NO.：170355-38-1
Empirical Formula: C7H7BrO2S
Molecular Weight: 235.1
MDL number: MFCD14155650
SAFETY DATA SHEET (SDS)
Update Date: 2026-05-29 18:28:35

What is Ethyl 5-bromothiophene-3-carboxylate?

Synthesis

20 g (147 mmol) of aluminum chloride are added portion-wise to a solution of 10 g (67 mmol) of ethyl thiophene-3-carboxylate in 160 ml of dichloro-methane, cooled to 0oC. The reaction medium is warmed to room temperature, and a solution of 4 ml (73 mmol) of bromine in 10 ml of dichloromethane is added. After reaction for 50 minutes at room temperature, the reaction medium is poured into a water + ice mixture and extracted with dichloromethane. The organic phase is dried over magnesium sulfate, filtered, and evaporated under vacuum. The residue obtained is purified by chromatography on a column of silica eluted with a 9/1 HEPTANE/ETHYL acetate mixture. 9 g (57percent) of ethyl 5-bromothiophene-3-carboxylate are obtained.

The Uses of Ethyl 5-bromothiophene-3-carboxylate

Ethyl 5-bromothiophene-3-carboxylate is an important organic reagent that can be used as a building block for the synthesis of many organic compounds. After hydrolysis, it can synthesize 5-Bromothiophene-3-carboxylic acid.

Properties of Ethyl 5-bromothiophene-3-carboxylate

Boiling point:	65-66 °C
Density	1.572±0.06 g/cm3(Predicted)
storage temp.	under inert gas (nitrogen or Argon) at 2–8 °C
color	Colourless to yellow
InChI	InChI=1S/C7H7BrO2S/c1-2-10-7(9)5-3-6(8)11-4-5/h3-4H,2H2,1H3

Safety information for Ethyl 5-bromothiophene-3-carboxylate

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation
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. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P332+P313:IF SKIN irritation occurs: Get medical advice/attention. P337+P313:IF eye irritation persists: Get medical advice/attention.

Computed Descriptors for Ethyl 5-bromothiophene-3-carboxylate

InChIKey	LUYMKCLOYODOEI-UHFFFAOYSA-N
SMILES	C1SC(Br)=CC=1C(OCC)=O

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