
Journal of the Chemical Society. Perkin transactions II p. 2121 - 2123 (1984)
Update date:2022-08-04
Topics:
Bullock, Philip J.
Byron, David J.
Harwood, David J.
Wilson, Robert C.
Woodward, Adrian M.
The liquid crystal transition temperatures of 1 3 4-alkoxy-N-(9-oxofluoren-2-ylmethylene)anilines are reported and discussed.The series gives a transition temperature plot of a similar type to that of the 2-p-alkoxybenzylideneaminofluorenones (in which the -CH=N- linkage is reversed), the N-I transition temperatures showing minima then maxima for the early homologues, but smectic properties do not occur until a late stage in the homologous series.Differences in liquid crystal thermal stability between the two series of azomethines of 9-oxofluorene are compared with the corresponding values for the 9,10-dihydrophenanthrene and biphenyl derivatives.
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