10127-53-4Relevant articles and documents
Steric Effects. Inversion of 4,5-Disubstituted 9,10-Dihydrophenanthrenes
Cosmo, Robert,Sternhell, Sever
, p. 35 - 47 (2007/10/02)
Six 4,5-di-X-9,10-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 (ΔG340) ranged from 120 kJ mol-1 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.