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4-Aminobenzoic acid (also known as para-aminobenzoic acid or PABA because the two functional groups are attached to the benzene ring across from one another in the para position) is an organic compound with the formula H 2 NC 6 H 4 CO 2 H. PABA is a white crystalline solid, [3] although commercial samples can appear gray.
In organic chemistry, benzoyl (/ ˈ b ɛ n z oʊ ɪ l /, BENZ-oh-il) [1] is the functional group with the formula −COC 6 H 5 and structure −C(=O)−C 6 H 5. [2] [3] It can be viewed as benzaldehyde missing one hydrogen. The benzoyl group has a mass of 105 amu. The term "benzoyl" should not be confused with benzyl, which has the formula − ...
It also can be prepared by treating benzaldehyde under nitration conditions, a process that initially converts the aldehyde to the acid. 4-Nitrobenzoic acid is a precursor to 4-aminobenzoic acid, which is in turn used to prepare the anesthetic procaine. 4-Nitrobenzoic acid is prepared by oxidation of 4-nitrotoluene.
4-Mercaptobenzoic acid (p-mercaptobenzoic acid, p-MBA) is an organosulfur compound with the formula para-C 6 H 4 (−SH)(−COOH). It is used as a ligand in thiolate-protected gold cluster compounds, such as Au 102 ( p -MBA) 44 .
4-Nitrobenzoic acid is prepared by oxidation of 4-nitrotoluene using oxygen or dichromate as oxidants. [7] Alternatively, it has been prepared by nitration of polystyrene followed by oxidation of the alkyl substituent. This method proceeds with improved para/ortho selectivity owing to the steric protection of the ortho positions by the polymer ...
p-Toluic acid (4-methylbenzoic acid) is a substituted benzoic acid with the formula CH 3 C 6 H 4 CO 2 H. It is a white solid that is poorly soluble in water but soluble in acetone . A laboratory route to p -toluic acid involves oxidation of p-cymene with nitric acid.
3-Nitrobenzoic acid is an organic compound with the formula C 6 H 4 (NO 2)CO 2 H. It is an aromatic compound and under standard conditions, it is an off-white solid. The two substituents are in a meta position with respect to each other, giving the alternative name of m-nitrobenzoic acid.
Aminomethylbenzoic acid (more precisely, 4-aminomethylbenzoic acid or p-aminomethylbenzoic acid, PAMBA) is an antifibrinolytic. [1] See also. 4-Aminobenzoic acid;