ORGANIC CHEMISTRY Chapter 14 o If more than two groups are present on the benzene ring, the positions must be indicated by the use of numbers OH CHO BI Br NH 2 HO 2, 6-Dibromophenol 2-amino-5-hydroxy benzaldehyde 2,6-二溴苯酚 2-氨基5-羟基苯甲醛 NO B CH CH ON C 4-Bromo-1, 2-dimethylbenzene 2-Chloro-1, 4-dinitrobenzene 1,2-二甲基-4-溴苯 1,4-二硝基-2-氯苯 Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 14 If more than two groups are present on the benzene ring, the positions must be indicated by the use of numbers. OH Br Br 2,6-Dibromophenol 2,6-二溴苯酚 CHO NH2 HO 2-氨基-5-羟基苯甲醛 2-amino-5-hydroxybenzaldehyde CH3 CH3 Br 1,2-二甲基-4-溴苯 4-Bromo-1,2-dimethylbenzene Cl NO2 O2N 1,4-二硝基-2-氯苯 2-Chloro-1,4-dinitrobenzene