ortho- (redirected from Arene substitution patterns)

ortho-

1. word element [Gr.], straight; normal; correct.

2. in organic chemistry, a prefix indicating a cyclic derivative having two substituents in adjacent positions. Symbol o-.

Examples of benzene derivatives with substituents in the ortho- position. (A), o -xylene (1,2-dimethylbenzene); (B), o -nitrophenol.

3. in organic chemistry, the common form of an acid.

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ortho- or orth-

pref.

1. Straight; upright; vertical: orthotropic.

2. Correct; correction: orthopsychiatry.

3. Hydrated form of an acid or of its salts: orthoboric acid.

4. Diatomic molecules in which the nuclei have the same direction of spin: orthohydrogen.

5. Abbr. o- Of or relating to one of three possible isomers of a benzene ring with adjacent carbon atoms having attached chemical groups: ortho-dibromobenzene.

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ortho-

[ôr′thə-]

prefix meaning "straight, normal, correct": orthobiosis, orthodontist, orthotopic.