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- W2070710221 abstract "By the use of strong oxidising and reducing agents, 4,5,7,8-tetramethyl[2.2]paracyclophane (II) has been converted to its radical cation (II+˙) and to its radical anion (II–˙). These radical ions, as well as those generated from the 12,13,15,16-tetradeuterio ([2H4]II) and the 1,1,10,10,12,13,15,16-octadeuterio-derivative ([2H8]II), have been studied by e.s.r. and, in part, by e.n.d.o.r. spectroscopy. In (II+˙), the bulk of the spin population is located on the methyl-substituted benzene ring, whereas, in (II–˙), it is found on the ring bare of methyl groups. This result corresponds to the effect of the alkyl substitution which enhances the donor and weakens the acceptor character of a π-system. Comparison of the hyperfine data for (II˙+) with those of the dimeric radical cation (II2+˙) reveals considerable deviations from the ratio of ca. 0.5, expected for the coupling constants of the protons in such two species. In the e.s.r. spectra of (II–˙) the large splittings from the nuclei of the counterions (39K 0.102 and 133Cs 0.596 mT) are notable; they exceed by one order of magnitude the corresponding values for the radical anion of [2.2]paracyclophane (I)." @default.
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- W2070710221 date "1980-01-01" @default.
- W2070710221 modified "2023-09-24" @default.
- W2070710221 title "The radical ions of 4,5,7,8-tetramethyl[2.2]paracyclophane" @default.
- W2070710221 doi "https://doi.org/10.1039/p29800001045" @default.
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