SEARCH Articles Figures Tables 2,5-disubstituted furan rings 2.5- disubstituted 1.5- fused ring Benzene derivatives para-disubstituted rings Disubstituted Ring Compounds Disubstituted benzene rings Disubstituted benzene rings directing effects Disubstituted benzene rings steric effects Disubstituted oxiranes, ring Disubstituted oxiranes, ring opening