250-84-0

Basic information

• Product Name: THIENO[2,3-B]THIOPHENE
• Synonyms: THIENO[2,3-B]THIOPHENE;1,6-Thiophthene;1,6-Dithiapentalene
• CAS NO: 250-84-0
• Molecular Formula: C₆H₄S₂
• Molecular Weight: 140.23
• Mol File: 250-84-0.mol
• Article Data: 8

Chemical Properties

• Melting Point: 7°C(lit.)
• Boiling Point: 226°C(lit.)
• Flash Point: 93℃
• Appearance: /liquid
• Density: 1.326 g/cm 3 at 25 °C
• Vapor Pressure: 0.126mmHg at 25°C
• Refractive Index: n20/D1.668
• Storage Temp.: Keep in dark place,Inert atmosphere,Room temperature
• CAS DataBase Reference: THIENO[2,3-B]THIOPHENE(CAS DataBase Reference)
• NIST Chemistry Reference: THIENO[2,3-B]THIOPHENE(250-84-0)
• EPA Substance Registry System: THIENO[2,3-B]THIOPHENE(250-84-0)

Safety Data

• Hazard Codes: Xn
• Statements: 22-36/37/38
• Safety Statements: 26
• RIDADR: UN 3334
• WGK Germany: 3
• Hazardous Substances Data: 250-84-0(Hazardous Substances Data)

Usage

Synthesis Reference(s)

Synthetic Communications, 21, p. 145, 1991 DOI: 10.1080/00397919108020803

InChI:InChI=1/C6H4S2/c1-3-7-6-5(1)2-4-8-6/h1-4H

Upstream product

• 7774-74-5 Thiophene-2-thiol 
• 74-86-2 acetylene 
• 96-43-5 2-thienyl chloride 
• 110-81-6 Diethyl disulfide 
• 51639-98-6 ethyldisulfanyl 
• 352-93-2 diethyl sulphide 
• 3600-24-6 diethyltrisulfane 
• 75-33-2 2-propanethiol 
• 75-08-1 ethanethiol 
• 33892-56-7 allyl(2-thiophene)sulfide 
• 540-59-0 1,2-Dichloroethylene 

Downstream Products

• 175202-58-1 3,4-dimethyl thieno[2,3-b]thiophene 
• 53255-78-0 3,4-dibromothieno<2,3-b>thiophene 
• 3958-03-0 Tetrabromothiophene 
• 53255-85-9 2,3,5-Tribrom-thieno<2,3-b>thiophen 
• 53255-86-0 4,4′,5,5′-tetrabromothieno[2,3-b]thiophene 
• 188290-36-0 thiophene 
• 7774-74-5 Thiophene-2-thiol 
• 251-41-2 thieno[3,2-b]thiophene 
• 3988-99-6 bis(thien-2-yl)sulfide 

Relevant articles and documents

High-Temperature Organic Synthesis. XLIV. Reaction of 2-Chlorothiophene with the System Dialkyl Disulfide-Acetylene

A convenient procedure is proposed for simultaneous preparation of thiophene and thienothiophene from readily accessible reactants by thermolysis of 2-chlorothiophene in the system diethyl disulfide-acetylene at 500-700 deg C.Thiophene results mainly from the reaction of acetylene with vinylthio radicals generated by thermal decomposition of diethyl disulfide.Thienothiophene is formed by reaction of acetylene with 2-thienylthio radicals generated by reaction of 2-chlorothiophene with hydrogen sulfide which is a product of thermal decomposition of diethyl disulfide.A mixture of lower dialkyl disulfides (disulfide oil) can be used instead of diethyl disulfide.

HIGH-TEMPERATURE REACTION OF 2-THIOPHENETHIOL WITH ACETYLENE

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FORMATION OF THIENOTHIOPHENES IN THE HIGH TEMPERATURE REACTION OF 2-CHLOROTHIOPHENE WITH COMPOUNDS CONTAINING THE C2H5S GROUP

The high temperature gas-phase reaction of 2-chlorothiophene with a mixture of diethyl disulfide and diethyl trisulfide constitutes a simple one-step synthesis of a 4:1 mixture of thioeno- and thieno-thiophenes.Their total yield depends on the nature of the donor of the ethylthio group.