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- W2062255348 abstract "The synthesis of several series of dinuclear aromatic compounds of the type p-FC6H4·Z·C6H4X [graphic omitted] is described. The 19F n.m.r.spectra are used to examine the transmission of substituent effects, due to the group X, across the bridge Z. It is necessary to distinguish between ‘transmission’(the trans-azo-and-azoxy-series) in which electron density is probably transferred from one ring to the other and ‘relay’(in the cis-azo- and -azoxy-series, and the hydrazo-series) in which the substituent effects most probably occur by modification of the repulsive interaction between the non-bonding lonepairs on the interconnecting nitrogen atoms. Support for this suggestion is given by observation of long range (11 bond) coupling between fluorine nuclei in n.m.r. spectra of the 4,4′-difluoro-members of the ‘transmission’ series and its absence in the spectra of the corresponding members of the ‘relay’ series. A recent examination of long range substituent effects in some analogous series is discussed and the results re-assessed. Some consideration is given to an analogous treatment of 13C and 1H n.m.r. shielding data in some 4-substituted styrene derivatives" @default.
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- W2062255348 date "1974-01-01" @default.
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- W2062255348 title "19F nuclear magnetic resonance studies of aromatic compounds. Part IV. Transmission of substituent effects across two aromatic rings connected by an N–N linkage" @default.
- W2062255348 doi "https://doi.org/10.1039/p29740000109" @default.
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