SEARCH Articles Figures Tables 3- Substituted 4,5-disubstituted 3- Substituted 4,5-disubstituted acetic anhydride Disubstituted Benzenes Ortho, Meta, and Para Substitution Substituted and 1,4-Disubstituted 1,3-Butadienes Substitution 1,3-disubstituted allenes Substitution 2,3-disubstituted benzofurans Substitution 2,3-disubstituted cyclohexenones Substitution 2.3- disubstituted tetrahydrofuran Substitution disubstituted alkenes Substitution disubstituted anilines