
%0 Journal Article
%A Craig, JT 
%T The synthesis of 6,7-Dihydrocyclohepta[<I>opqr</I>]benzo[<I>c</I>]phenanthrene
%J Australian Journal of Chemistry
%D 1970/07/01
%V 23
%N 7
%P 1465-1470
%K 
%R https://doi.org/10.1071/CH9701465
%U https://www.publish.csiro.au/paper/CH9701465 
%X 6,7-Dihydrocyclohepta[opqr]benzo[c]phenanthrene, the first example of a hydrocarbon containing a seven-membered ring with four contiguously fused aromatic rings, has been prepared. A preliminary examination of the n.m.r, spectrum shows the signal from the four aliphatic protons coalesce to a sharp singlet at temperatures above -40º. Attempts to dehydrogenate this compound to the fully unsaturated hydrocarbon were unsuccessful. 
