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Photohomolysis and Photoionization of Substituted Tetraphenylethanes and C–C Fragmentation of 1,1,2,2‐Tetra( p ‐R‐phenyl)ethane Radical Cations (R=H, CH 3 , OCH 3 , Cl)
Author(s) -
Faria Joaquim L.,
McClelland Robert A.,
Steenken Steen
Publication year - 1998
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/(sici)1521-3765(19980710)4:7<1275::aid-chem1275>3.0.co;2-x
Subject(s) - homolysis , chemistry , photoionization , carbocation , radical , photodissociation , bond cleavage , photochemistry , fragmentation (computing) , medicinal chemistry , yield (engineering) , radical ion , ion , organic chemistry , ionization , catalysis , materials science , operating system , computer science , metallurgy
Two parallel reactions occur on photolysis of a series of tetraphenylethanes in 2,2,2‐trifluoroethanol (below): one‐photon homolysis of the central C–C bond yields the corresponding substituted diphenylmethyl radicals, but under conditions of high photon fluxes, biphotonic photoionization produces a radical cation, which subsequently undergoes efficient C–C scission of the aliphatic central bond to yield the radical and carbocation fragments.