Syntheses and Physical Properties of Several symmetrical Sexiphenyls

概要

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Seven sexiphenyls, including three new isomers, 3,4,3', 4'-tetraphenylbiphenyl (Id), 2,5,2', 5'-tetraphenylbiphenyl (IIId), and 2,2'-di (3-biphenylyl) biphenyl (Vd), were synthesized by Ullmann homo-coupling of iodoterphenyl. The characteristic bands of the infrared spectra (675-920 cm^<-1>) and signals of the nuclear magnetic resonance spectra of the sexiphenyls were assigned tentatively and are discussed briefly. Infrared studies indicated that the range 730-770 cm^<-1>, generally accepted as the position of the C-H out-of-plane bending bands of phenyl rings, should be widened slightly to 730-782cm^<-1>. The ultraviolet spectra commonly displayed a intense E-band in the narrow region of 192-207 nm. The prominent K-band above ca. 260 nm of branched sexiphenyls was taken as indicative of the presence of one or more p-linkages, as in the case of linear compounds.
社団法人日本薬学会の論文
1980-05-25