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aamera

Nomenclature

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Can any one of U tell me the preference order of functional groups while naming to compound having more than one functional groups (by IUPAC system)

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A short look on the net yielded the following:

 

1 Cations

2 Carboxylic acids, Thiocarboxylic acids, Selenocarboxylic acids, Sulfonic acids,Sulfinic acids,Sulfenic acids

3 Esters, Acyl chlorides, Amides, Imides, Amidines

4 Nitriles, Isonitriles

5 Aldehydes, Thioaldehydes

6 Ketones, Thioketones

7 Alcohols, Thiols, Selenols, Tellurols

8 Hydroperoxides

9 Amines, Imines, Hydrazines

10 Ethers, Thioethers, Selenoethers

11 Peroxides, Disulfides

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for basic reading this may prove interesting (as well as the links to information on the functional groups) :)

 

-- Ryan Jones

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Wikipedia may not be good for literary sources, but they are absolutely amazing for science-related material. Who contributes to all those organic chem pages?!

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Wikipedia may not be good for literary sources, but they are absolutely amazing for science-related material. Who contributes to all those organic chem pages?!

 

 

Hundreds of people :) Probably took days worth of work to compile all the data, clarify it etc.

 

-- Ryan Jones

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As of right now, the name for the following substutuent escapes me, any help would be appreciated.

 

-C(=O)OCH3

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I know it is an ester. How would you name this if it did not have priority and had to be named as a substituent.

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I know it is an ester. How would you name this if it did not have priority and had to be named as a substituent.

 

It's treated as an carboxylic acid derivative and alcohol derivative (see the mechanism for the Fischer Esterification reaction) so you separate the molecule into two parts.

 

so this molecule:

 

CH3 - C(=O)-OCH3

 

Would be called Methyl Acetate. The methyl group, which is from the alcohol, is first, and the Acetic acid is second.

 

Regarding priority, you don't have to worry about it. It's a derivative of a carboxylic acid, which has the highest assigned priority of any functional group. Therefore, it gets the suffix. If there are any other functional groups on the molecule, they would be assigned a prefix.

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I know how to name esters. That was not the question. But I did find the answer else where. They are named as alkoxycarbonyls, as in [2-(Ethoxycarbonyl)ethyl]trimethylammonium ion

C2H5-C(=O)O-CH2CH2-N+(CH3)3 (positive charge on nitrogen)

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