Question

As we know that in IUPAC nomenclature system carboxyl group is given highest priority while naming .So do you know any case where carboxyl group is used as substituent?If not then when is its prefix carboxy used? PLS HELP

Answer 1

Explanation:

Well, Yes, there are many examples in which Carboxylic group is used as substituent.

Like propane-1,2,3-tricarboxylic acid. Here it's suffix isn't used here prefix is used. because as we know that in IUPAC Nomenclature longest chain is selected as main chain and in propane-1,2,3-tricarboxylic acid there is the longest chain of 5 carbon but only three carbon is used as long chain because if we used 5 carbon as long chain then the name of the compound is 3-carboxyl petan-1,5-dioic acid. and this is wrong because here 1 Carboxylic acid group isn't in the chain and it becomes a wrong nomenclature. So, prefix of Carboxylic acid is used in this case and Propane-1,2,3-carboxylic acid is correct IUPAC name.

There are more examples where prefix is used for Carboxylic acid group :-

1. propan-1,2,3-tricarboxylic acid
2. benzene-1,2-dicarboxylic acid
3. 2-methylcyclopentane Carboxylic acid.