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A Contribution to the Direct Observation of a Didehydroheteroaromatic with a Five‐Membered Ring: 2,3‐Didehydrothiophene
Author(s) -
Teles Joaquim Henrique,
Hess B. Andes,
Schaad Lawrence J.
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921250221
Subject(s) - chemistry , matrix isolation , flash vacuum pyrolysis , ring (chemistry) , pyrolysis , spectroscopy , photodissociation , infrared spectroscopy , matrix (chemical analysis) , organic chemistry , chromatography , physics , quantum mechanics
Abstract The flash vacuum pyrolysis and the photolysis of 2,3‐thiophenedicarboxylic acid anhydride ( 6 ) were investigated by using the technique of matrix isolation combined with FT‐IR spectroscopy. No conclusive proof for the existence of 2,3‐didehydrothiophene ( 1 ) could be found, but two hitherto unknown isomers were isolated and characterized: vinylidenethioketene ( 10 ) and thioformylvinylidenecarbene ( 15 ).