What is meta directing deactivators?

Meta director: In electrophilic aromatic substitution, a substituent that favors electrophilic attack meta to the substituent. Most meta directors are also deactivators. Bromination of nitrobenzene gives meta-bromonitrobenzene as the major product because the nitro group is a meta director.

What is meta position in organic chemistry?

In chemistry, meta is a prefix, used for systematic names in IUPAC nomenclature. In organic chemistry, meta indicates the positions of substituents in aromatic cyclic compounds. The substituents have the 1,3-positions, for example in resorcinol.

Which are meta directing groups?

Examples of meta– directors include nitriles, carbonyl compounds (such as aldehydes, ketones, and esters), sulfones, electron-deficient alkyl groups, nitro groups, and alkylammoniums.

What are activators and deactivators in organic chemistry?

Generally speaking, electron donators / activators have a lone pair of electrons or an electron density that “pushes” into the benzene. Electron withdrawers / deactivators have a positive charge on the substituent or a very electronegative atom attached to it, which “pulls” electrons out of the benzene.

What are ortho meta para directors?

If the relative yield of the ortho product and that of the para product are higher than that of the meta product, the substituent on the benzene ring in the monosubstituted benzene is called an ortho, para directing group. If the opposite is observed, the substituent is called a meta directing group.

Is NH2 meta directing?

In NH2 the nitrogen attached to the benzene ring has excess of electron hence it is + R directing group. While in NO2 the nitrogen attached to the benzene ring do not have extra lone pair of electrons hence it is -R effecting group which is meta directing.

What makes something a meta director?

Where is the meta position?

Meta is used to describe a molecule with substituents are at the 1 and 3 positions on an aromatic compound.

Is COOH a meta director?

With the exception of halogens, meta directors deactivate a benzene ring. For example, a carboxylic acid is a meta director because it experiences resonance, a delocalization of electrons.

Is fluorine meta directing?

The inductive and resonance properties compete with each other but the resonance effect dominates for purposes of directing the sites of reactivity. For nitration, for example, fluorine directs strongly to the para position because the ortho position is inductively deactivated (86% para, 13% ortho, 0.6% meta).

What is the difference between ortho meta and para?

Summary – Ortho Para vs Meta Substitution The key difference between ortho para and meta substitution is that ortho substitution has two substituents in 1 and 2 positions of the ring, and para substitution has two substituents in 1 and 4 positions. Whereas, meta substitution has two substituents in 1 and 3 positions.

Is ch3 meta directing?

1: Thus, the methyl group is an ortho, para directing group. Thus, the nitro group is a meta directing group. Ortho, para directing groups are electron-donating groups; meta directing groups are electron-withdrawing groups.