Restricted Rotation Involving the Tetrahedron Carbon. XLIII. Buttressing Effect on Rotational Barriers in Bromine-substituted 9-(2-Methoxy-4,6-dimethylphenyl)fluorenes

Article abstract of DOI:10.1246/bcsj.55.2512

9-(2-Methoxy-4,6-dimethylphenyl)fluorenes carrying one or two bromo groups on the phenyl ring were prepared and the buttressing effect on the rotational barrier about the C₉-C_ph bond were investigated.The free energies of activation