
TY  - JOUR
A1  - Craig, JT 
T1  - The synthesis of 6,7-Dihydrocyclohepta[<I>opqr</I>]benzo[<I>c</I>]phenanthrene
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1970
VL  - 23
IS  - 7
SP  - 1465
EP  - 1470
KW  - 
UR  - https://doi.org/10.1071/CH9701465 
N2  - 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. 
ER  -

