Page 157 - Pharm.Org.Chem-I 02-06-05-101
P. 157
2- Disubstituted compounds:
When two substituents are present, their relative positions are indicated by the prefixes ortho-
, meta-, and para- (abbreviated o-, m-, and p-) or by the use of numbers.
1,2-dimethylbenzene 1,3-dimethylbenzene 1,4-dimethylbenzene
Ortho-xylene or o-xylene Meta-xylene or m-xylene Para-xylene or p-xylene
11
2- Disubstituted compounds:
2-nitrobenzoic acid 3- nitrobenzoic acid 4- nitrobenzoic acid
o-nitrobenzoic acid m-nitrobenzoic acid p-nitrobenzoic acid
12
155
