What is the chemical structure of Salicylate Sodium? It is composed of a sodium benzoate (derived from a benzoic acid that belongs to the carboxyli...
What is the chemical structure of Salicylate Sodium?
It is composed of a sodium benzoate (derived from a benzoic acid that belongs to the carboxylic acids also called the sodium salt of benzoic acid) and a hydroxyl group.
In the latter case, the hydroxyl is attached to a carbon that is part of an aromatic ring, which gives rise to the formation of a phenol. The aromatic ring is capable of stabilizing a negative charge on the oxygen through resonance, so phenols are considerably more acidic than alcohols.
The hydroxyl group can act as a hydrogen donor in a hydrogen bond. In addition, the oxygen of the hydroxyl group has two pairs of free electrons, so it can also receive two hydrogen bonds as an acceptor. In other words, the hydroxyl group can form a total of three simultaneous hydrogen bonds.
Again due to the polarity of the O-H bond, and also because oxygen has a good capacity to support a negative formal charge when it loses hydrogen, hydroxyl groups can donate the proton acting as a Brønsted-Lowry acid.
The particular value of the pKa or the acidity of the hydroxyl group will depend on the structure of the rest of the molecule to which it is linked. If the -OH is directly linked to a carbonyl group (as in carboxylic acids), then it will be considerably acidic, with pKa values in the range of 3 to 5. If it is attached to an aromatic group, as in the case of phenols, its pKa will be in the range of 7 to 10; if it is linked to an aliphatic chain, its pKa will be 15 or more.
The hydroxyl group alone is not a functional group, as it depends on what it is attached to.
Phenols are very similar to alcohols except that in this case, the hydroxyl group is attached to a carbon that is part of an aromatic ring.
The most characteristic reaction of carboxylic acids and that differentiates them from aldehydes and ketones is the Nucleophilic Substitution Reaction, by which carboxylic acids are converted into their derivatives.
Reduction reactions. Carboxylic acids
It is composed of a sodium benzoate (derived from a benzoic acid that belongs to the carboxylic acids also called the sodium salt of benzoic acid) and a hydroxyl group.
In the latter case, the hydroxyl is attached to a carbon that is part of an aromatic ring, which gives rise to the formation of a phenol. The aromatic ring is capable of stabilizing a negative charge on the oxygen through resonance, so phenols are considerably more acidic than alcohols.
The hydroxyl group can act as a hydrogen donor in a hydrogen bond. In addition, the oxygen of the hydroxyl group has two pairs of free electrons, so it can also receive two hydrogen bonds as an acceptor. In other words, the hydroxyl group can form a total of three simultaneous hydrogen bonds.
Again due to the polarity of the O-H bond, and also because oxygen has a good capacity to support a negative formal charge when it loses hydrogen, hydroxyl groups can donate the proton acting as a Brønsted-Lowry acid.
The particular value of the pKa or the acidity of the hydroxyl group will depend on the structure of the rest of the molecule to which it is linked. If the -OH is directly linked to a carbonyl group (as in carboxylic acids), then it will be considerably acidic, with pKa values in the range of 3 to 5. If it is attached to an aromatic group, as in the case of phenols, its pKa will be in the range of 7 to 10; if it is linked to an aliphatic chain, its pKa will be 15 or more.
The hydroxyl group alone is not a functional group, as it depends on what it is attached to.
Phenols are very similar to alcohols except that in this case, the hydroxyl group is attached to a carbon that is part of an aromatic ring.
The most characteristic reaction of carboxylic acids and that differentiates them from aldehydes and ketones is the Nucleophilic Substitution Reaction, by which carboxylic acids are converted into their derivatives.
Reduction reactions. Carboxylic acids
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Ed 
A estrutura química do Salicilato de Sódio é composta por um grupo benzoato de sódio (derivado do ácido benzóico que pertence aos ácidos carboxílicos, também chamado de sal de sódio do ácido benzóico) e um grupo hidroxila. No último caso, a hidroxila está ligada a um carbono que faz parte de um anel aromático, o que resulta na formação de um fenol. O anel aromático é capaz de estabilizar uma carga negativa no oxigênio por meio de ressonância, portanto, os fenóis são consideravelmente mais ácidos do que os álcoois.
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