
%0 Journal Article
%A Lai, Y 
%A Marriott, PJ 
%A Tan, B 
%T The Barrier to Rotation in 9,10-Bis(2,3-dimethylphenyl)phenanthrene: Conformational Interconversion Observed at High Temperatures by Means of Gas Chromatography
%J Australian Journal of Chemistry
%D 1985/02/01
%V 38
%N 2
%P 307-314
%K 
%R https://doi.org/10.1071/CH9850307
%U https://www.publish.csiro.au/paper/CH9850307 
%X A mixture of the syn and anti conformers of 9,10-bis(2,3- dimethylphenyl ) phenanthrene was prepared. The unexpectedly high energy barrier for the free rotation of the two aryl rings is described. Variable temperature 1H n.m.r . studies failed to provide thermodynamic data for the conformational inter-conversion due to limitations in practicably measurable temperature range. The energies of activation for both interconversion processes were, however, determined by gas chromatographic studies in the temperature range of 225-300&#176;C. 
