phenols n.
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Phenols - PowerPoint PPT Presentation


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Phenols. Definition: When the hydroxyl group (-OH) is attached to an aromatic ring, it is called P henol. Nomenclature of Phenols: The nomenclature of the phenol is done by two methods. 1) Simple method 2) Numbering method.

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Definition:

When the hydroxyl group (-OH) is attached to an aromatic ring, it is called Phenol.

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Nomenclature of Phenols:

The nomenclature of the phenol is done by two methods.

1) Simple method

2) Numbering method

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Simple method : In this method the substituent attached on the aromatic ring with respect to -OH group is designated as ortho, meta, para as prefix to the name of phenol.

Methyl phenols are often called Cresols.

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Numbering method: In this method, the carbon atom of the aromatic ring to which -OH group is attached is given number 1. Then the carbon atom of the ring to which the other substituent is attached is given lowest possible number.

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Polysubstituted derivatives of phenol :

If more than two group are attached to the aromatic ring, only number method is used to indicate their relative position w.r.t. –OH group