62943-62-8

Basic information

• Product Name: bis(methylselanyl)ethyne
• Synonyms: Bis(methylselanyl)acetylene; ethyne, 1,2-bis(methylseleno)-; Ethyne, bis(methylseleno)-
• CAS NO: 62943-62-8
• Molecular Formula: C₄H₆Se₂
• Molecular Weight: 212.0104
• Mol File: 62943-62-8.mol
• Article Data: 3

Chemical Properties

• Boiling Point: 209.8°C at 760 mmHg
• Flash Point: 80.7°C
• Vapor Pressure: 0.287mmHg at 25°C
• CAS DataBase Reference: bis(methylselanyl)ethyne(CAS DataBase Reference)
• NIST Chemistry Reference: bis(methylselanyl)ethyne(62943-62-8)
• EPA Substance Registry System: bis(methylselanyl)ethyne(62943-62-8)

Safety Data

• Hazardous Substances Data: 62943-62-8(Hazardous Substances Data)

Upstream product

• 62782-96-1 3,4-Bis(methylseleno)cyclobuten-1,2-dion 
• 129815-58-3 (E)-1-Chloro-1,2-bis-methylselanyl-ethene 
• 62943-49-1 trans-Dimethylselenodiethylaminoethen 

Relevant articles and documents

A New Approach to the Synthesis of Symmetrical Bis(organylchalcogeno)acetylenes: Scope and Limitations

A new general method to prepare bis(organylchalcogeno)acetylenes R-Y-CC-Y-R (Y = S, Se, Te) by dehydrochlorination of the corresponding 1,2-bis(organylchalcogeno)chloroethylenes R-Y-CH=CCl-Y-R with tert-BuOK/tert-BuOH and/or KOH/DMSO is developed.Dechlorination of 1,2-bis(organylchalcogeno)-1,2-dichloroethylenes R-Y-CCl=CCl-Y-R (Y = S, Se, Te) with BuLi in ether or THF is effective only for sulfur derivatives.With Y = Se and alkyl substituents, substitution of the chlorine atom by a butyl group takes place giving rise to 5,6-bis(alkylseleno)dec-5-ene .With aryl substituents, an attack of the ArSe-group by the Bu-radical is observed leading to an aryl butyl selenide.In the case of the tellurium compound Ph-Te-CCl=CCl-Te-Ph, there is a competition between dechlorination to give Ph-Te-CC-Te-Ph, and substitution to produce the phenyl butyl telluride. - Keywords: bis(organylchalcogeno)acetylene; 1,2-bis(organylchalcogeno)chloroethylene; 1,2-bis(organochalcogeno)-1,2-dichloroethylene.

Analysis and Optimization of Gasphase Reactions, 19. Pyrolysis of Cyclobutene-1,2-diones Yielding Acetylenes

The gasphase pyrolyses of cyclobutene-1,2-dione derivatives X2C4O2 with X = Cl, SCH3 and SeCH3 proceed in the low-temperature reaction channel via elimination of 2CO to yield the corresponding acetylenes X-CC-X.PE spectra are used to characterize the educts, to optimize the reaction conditions, and - based on (methylthio)acetylene - to determine the C2 conformation of bis(methylthio)- and bis(methylseleno)acetylene in the gaseous phase.