1-Aryl-<i>F</i>-1,3-butadienes and Unsymmetrical α,ω-Diaryl-<i>F</i>-polyenes
作者:Alexander B. Shtarev、Mikhail M. Kremlev、Zdenek Chvátal
DOI:10.1021/jo960196e
日期:1997.5.1
s RC(6)H(4)(CF=CF)(n)()C(6)H(4)R', where n = 2 or 3 and R' is one of the substituents specified above. A variety of new synthons containing alpha,omega-diaryl-F-1,3-butadiene skeleton and reactive Br, OH, CH=O, and COOH functionalities in para-positions on aromatic rings has been also prepared. Structural aspects, NMR spectra, and mesogenic properties of the title compounds are discussed.
The principles for constructing diarylpolyfluoromethine dyes with the [4-(CH3)2NC6H4(CF=CF)nCFC6H4N-(CH3)2-4']+ X- structure from their difluorovinylene predecessors have been developed and their electronic and F-19 NMR spectra studied. The difluorovinylene shift is these dyes has been shown to be greater than that in their hydrogen analogues.
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