
TY  - JOUR
A1  - Cosmo, R 
A1  - Sternhell, S 
T1  - Steric Effects. Inversion of 4,5-Disubstituted 9,10-Dihydrophenanthrenes
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 987
VL  - 40
IS  - 1
SP  - 35
EP  - 47
KW  - 
UR  - https://doi.org/10.1071/CH9870035 
N2  - Six 4,5-di-X-9,l0-dihydrophenanthrenes (X = H, F, OCH3, Cl, CH3, CF3) were synthesized and their inversion rates were investigated by n.m.r., spectroscopy. The barriers to inversion at a standard temperature (&#8710;G&#8225;;340) ranged from <25 to >120 kJ mol-l and showed good correlation with the van der Waals radii of the interacting substituents at C4 and C5 and with the previously proposed 'apparent overlap' parameter. 
ER  -

