Premium
Electron impact induced synthesis of benzo[2,1‐ b :3,4‐ b ′]dithiophene
Author(s) -
Sturaro Alberto,
Traldi Pietro,
Audisio Guido,
Destri Silvia,
Catellani Marinella
Publication year - 1990
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570270705
Subject(s) - chemistry , isomerization , moiety , thiophene , mass spectrometry , ion , electron ionization , medicinal chemistry , kinetic energy , photochemistry , stereochemistry , organic chemistry , catalysis , physics , chromatography , quantum mechanics , ionization
The photochemical behaviour of cis and trans 1 ,2‐bis(2‐bromo‐3‐thienyl)ethene has been separately studied with respect to cyclization to benzo[2,1‐ b :3,4‐ b ′]dithiophene (BDT). The gc/ms analysis of the mother liquors of the two isomers photoreaction shows the opposite direction of isomerization followed by production of intractable materials resulting by the radical breaking of one of the two C‐Br bonds on the thiophene moiety. On the contrary, in EI mass spectrometry both the isomers give rise to fragment ions at m/z 190 studied and compared to BDT with the aid of mass analysed ion kinetic energy spectrometry and collisional spectroscopy.