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Why acylation occur at phenol rather than carboxylic acid in salicylic acid?
Wiki User
∙ 11y ago
This is actually quite simple: the pKa of the carboxylic acid group is only about 3, but the pKa of the phenolic group is 13.4.
Wiki User
∙ 11y ago
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What characteristics of a molecule make it an amino acid?
Being both an amine and an acid, of course.Generally the term is used mainly for a specific type of amino acids... alpha-amino carboxylic acids. However, taurine is also called an amino acid, despite the fact that it's a sulfonic acid rather than a carboxylic acid.(alpha-amino means the amine group is attached to the first carbon after the carboxylic acid carbon itself. In taurine, the amine group is attached to the second carbon after the sulfonic acid group.)
What is the difference between amino acids and peptides?
amino acids contain an amine and a carboxylic acid
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What is the chemical formula of wintergreen oil?
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What was carboxylic acid used for?
Rather than there being a substance called carboxylic acid, scientists call the-COOH group that occours frequently in many different compounds the carboxylic acid functional group.
Why phenol do not give protonation reaction readly?
Electron density on oxygen in phenoxide ion is decreased due to resonance. The oxygen rather acquire a positive charge. Therefore phenol does not give protonation readily
Can salicylic acid be used on cats?
No it upsets the solfuric acid in the stomach [Q to answerer. Are you sure of sulfuric acid rather than hydrochloric?]
Why does the alkali-catalysed hydrolysis of an ester produce a sodium salt rather than a carboxylic acid?
An acid can not survive in a basic medium. CH3-COOH + NaOH -------> CH3-COONa + H2O
What characteristics of a molecule make it an amino acid?
Being both an amine and an acid, of course.Generally the term is used mainly for a specific type of amino acids... alpha-amino carboxylic acids. However, taurine is also called an amino acid, despite the fact that it's a sulfonic acid rather than a carboxylic acid.(alpha-amino means the amine group is attached to the first carbon after the carboxylic acid carbon itself. In taurine, the amine group is attached to the second carbon after the sulfonic acid group.)
What are the harmful effects of phenol present in dark chocolate?
•The substance can cause harmful effects on the central nervous system and heart resulting in coma. Phenol can also have its bad effects on liver and kidneys. Continuous use of phenol can corrode skin and tissue, can cause severe allergic reactions like difficulty breathing, tightness in chest, swelling of mouth, lips or tongue. It causes respiratory irritation, respiratory cancer, headaches, muscle pain. It can have bad impacts on immune system. •Rather than dark chocolate phenol also have other pathways in the environment to enter our body. This include consumer products like the throat lozenges, mouth washes, gargles, sausages, toilet cleaners and disinfectants, mountain cheese etc.
What is the difference between amino acids and peptides?
amino acids contain an amine and a carboxylic acid
What hydrogen ion is released by a carboxylic acid?
A carboxylic acid has the form:R-COOH or R-C(=O)OHWhere R is a hydrocarbon chain.A diagram from Wikipedia:The Hydrogen attached to the OH the one released by the acid.In reality, both bonds to the oxygen probably have some aspect of being 1 1/2 bonds rather than true double bonds (resonance), although, apparently in the acid form they are of different lengths. However, the bond lengths equalize when in the conjugate base form.
Why is benzoic acid more soluble in alkaline solution rather than neutral or acid solution?
It would depend on the solvent that phenol or benzoic acid are being placed in. Benzoic acid would be more soluble in a polar solvent because of the carbonyl group's extreme electronegativity.
How are carboxylia acids produced?
Generally 3 types or reactions are used to produce carboxylic acids:(1) Hydrolysis (i.e. reacting with water) of carboxylic acid derivatives such as esters, amides, anhydrides, acid halides, or nitriles.(2) Oxidation of primary alcohols & aldehydes(3) Grignard reactionThese are found in any organic chemistry book. The explanations are rather lengthy to include here plus I'm not sure of your general knowledge of organic chemistry so you can understand it. But hopefully that helps. Post another question if you want more specific information.
Melting point of Phenol formaldehyde?
Because phenol formaldehyde is a resin it is usually a mixture of chain lengths and cross linking. For this reason, you would not expect it to have a fixed melting point - rather it would usually have either a melting point range or a decomposition temperature (depending on the structure). As an example, the company Polyols and Polymers lists the melting point range of their POLYTONE PF 201 product as 700C-850C while their POLYTONE AP 132 product has a "softening point" of 970C-1100C but no melting point. Bakelite - which is one of the many types of phenol formaldehyde resin - is a thermosetting plastic which has no melting point; it has a decomposition point. As an example, the Bakelite manufactured by Jiacheng-Chem Enterprises Ltd. has a listed decomposition point range of 240~ 280°C. Again, because it is a mixture of polymer sizes and degree of cross linking, it doesn't have just one fixed temperature; it has a range over which the many different molecules will decompose. The temperatures under which phenol formaldehyde will melt, soften, or decompose are also affected by the amount of residual monomers still present in the polymer matrix.
Is enoxaparina available in oral form rather than injections?
enoxapirina until now as a cardiologist, I know there is no avalaible oral form, if you are an CAD patient, post infarction patient, there are many oral drugs for secondary prevention, such as ASA (acetyl salicylic acid/aspirin), clopidogrel (R/plavix etc), or ticlopidine used in combination with similar function as enoxaparin, for outpatient (armand MD FIHA, cardiologist)
