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Preamble

ortho-, meta-, para-

The positions of substituents are indicated by numbers except that o- (ortho), m- (meta), and p- (para) may be used in place of 1,2-, 1,3-, and 1,4-, respectively (cf. Rule A-12.3), for benzene derivatives.

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This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.

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