Ortho

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For the prefix, see wiktionary:ortho-; for the speciality of dentistry, also commonly referred to as ortho-, see orthodontics.

In organic chemistry, "ortho" (along with "meta" and "para") is used to distinguish the three types of isomer of disubstituted benzenes: it indicates that the substituents are at locants 1 and 2. It is printed in italic type, and is often abbreviated as o in compound names. For example, the compound name ortho-xylene is equivalent to o-xylene.

[edit] See also

• Arene substitution patterns
• Orthodontics