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Photoisomerization of Bicyclopropylidene and 1,2‐Dimethylenecyclobutane in Rare‐Gas Matrices: Towards the IR‐Spectroscopic Identification of Tetramethyleneethane (2,3‐Dimethylenebutane‐1,4‐diyl)
Author(s) -
Maier Günther,
Senger Stefan
Publication year - 1999
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/(sici)1099-0690(199906)1999:6<1291::aid-ejoc1291>3.0.co;2-m
Subject(s) - chemistry , photoisomerization , xenon , rare gas , matrix isolation , photochemistry , argon , absorption (acoustics) , excimer , irradiation , matrix (chemical analysis) , absorption spectroscopy , infrared , excimer laser , infrared spectroscopy , analytical chemistry (journal) , laser , atomic physics , isomerization , organic chemistry , optics , physics , chromatography , nuclear physics , catalysis
Bicyclopropylidene ( 3 ) and 1,2‐dimethylenecyclobutane ( 7 ) have been irradiated in rare‐gas matrices. If 1,2‐dimethylenecyclobutane ( 7 ) is exposed to the light of a KrF excimer laser (λ = 248 nm), an isomeric species is produced, showing an absorption at 793.1 cm –1 (argon matrix) or 791.2 cm –1 (xenon matrix) in the IR spectrum. The back reaction can be induced with light of λ = 254 nm. This photochemical interconversion, together with the comparison between the experimental and calculated band positions, supports the assignment of the IR absorption near 790 cm –1 to tetramethyleneethane ( 5 ).