2,4-Dihydroxybenzaldehyde, also known as 4-hydroxy-2-formylphenol, is an organic compound with the chemical formula C₇H₆O₃. It belongs to the class of benzaldehydes and is characterized by the presence of two hydroxyl groups (-OH) at the 2nd and 4th positions and an aldehyde group (-CHO) at the 1st position of the benzene ring.
This compound is a white to off-white crystalline solid that is soluble in water, ethanol, and other organic solvents. Due to its chemical structure, it exhibits both phenolic and aldehydic properties, making it a versatile intermediate in organic synthesis. It can participate in various chemical reactions, such as condensation, oxidation, and reduction, leading to the formation of diverse derivatives.
In practical applications, it is used in the synthesis of pharmaceuticals, agrochemicals, and dyes. It serves as a precursor for the production of antibacterial agents, antioxidants, and other bioactive compounds. Additionally, its unique chemical properties make it valuable in research as a model compound for studying reaction mechanisms and exploring new synthetic pathways.
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Chemical Formula |
C7H6O3 |
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Exact Mass |
138.03 |
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Molecular Weight |
138.12 |
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m/z |
138.03 (100.0%), 139.04 (7.6%) |
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Elemental Analysis |
C, 60.87; H, 4.38; O, 34.75 |
Organic Synthesis Intermediate
2,4-Dihydroxybenzaldehyde serves as an important intermediate in organic synthesis. Its structure, containing both hydroxyl and aldehyde functional groups, makes it reactive and versatile. It can be easily converted into other compounds through various chemical reactions, such as oxidation, reduction, condensation, and substitution. This makes it a valuable building block for the synthesis of complex organic molecules.
Structural Features and Reactivity
Also known as resorcinol aldehyde, possesses a benzene ring substituted with hydroxyl groups at the 2nd and 4th positions and an aldehyde group at the 1st position. This combination of functional groups imparts several key properties:
Hydroxyl Groups
The two hydroxyl groups enhance the compound's solubility in polar solvents and provide sites for hydrogen bonding, which can influence its physical properties and reactivity. They also make the molecule susceptible to reactions such as esterification, etherification, and oxidation.
Aldehyde Group
The aldehyde group is highly reactive and can undergo a variety of transformations, including oxidation to carboxylic acids, reduction to alcohols, and condensation reactions to form imines, hydrazones, or other carbon-carbon bonds.
Applications
Synthesis of Complex Organic Molecules
Pharmaceuticals
It can be used to synthesize a wide range of pharmaceutical compounds, including antibiotics, anti-inflammatory agents, and anticancer drugs. Its reactivity allows for the introduction of diverse functional groups, enabling the construction of complex molecular architectures.
Natural Products
Many natural products contain resorcinol or resorcinol-like motifs. It serves as a starting material for the synthesis of these compounds, facilitating the total synthesis of biologically active natural products.
Polymers and Materials
The compound can be incorporated into polymers to impart specific properties, such as improved solubility, thermal stability, or mechanical strength. It can also be used to synthesize functional materials with applications in electronics, optics, and catalysis.
Significance
Building Block: It serves as a fundamental building block for the construction of more complex molecules. Its reactivity and versatility make it an indispensable tool in the synthetic chemist's arsenal.
Synthetic Flexibility: The compound's ability to undergo a wide range of chemical transformations allows for the synthesis of diverse molecular structures, enabling the exploration of new chemical space and the discovery of novel compounds with potential applications.
Efficiency and Cost-Effectiveness: Using it as an intermediate can streamline synthetic routes, reducing the number of steps and improving overall efficiency. This can also lead to cost savings in the production of target molecules.
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Dye Intermediate
In the dye industry, it is used as an intermediate for the production of certain dyes. Its chemical properties allow it to participate in reactions that form the chromophoric groups responsible for the color of the dyes. This makes it an essential component in the manufacture of various types of dyes used in textiles, leather, and other materials.
Chemical Properties and Reactivity
With its two hydroxyl groups and an aldehyde group, exhibits several key chemical properties that make it valuable in dye synthesis:
Hydroxyl Groups
The presence of hydroxyl groups enhances the compound's solubility in polar solvents and provides sites for hydrogen bonding. These groups can also participate in reactions such as esterification, etherification, and acylation, which are important for modifying the dye molecule's structure and properties.
Aldehyde Group
The aldehyde group is highly reactive and can undergo a variety of transformations, including:
- Condensation Reactions: It can react with amines, hydrazines, or other nucleophiles to form imines, hydrazones, or azomethines, which are often chromophoric and contribute to the dye's color.
- Oxidation and Reduction: The aldehyde group can be oxidized to a carboxylic acid or reduced to an alcohol, providing additional functional groups for further modification.
Applications
Azo Dyes
It can be used to synthesize azo dyes, which are characterized by the presence of an azo group (–N=N–) linking two aromatic rings. The hydroxyl and aldehyde groups can be modified to introduce the azo group, resulting in dyes with a wide range of colors.
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Anthraquinone Dyes
It can serve as a starting material for the synthesis of anthraquinone dyes, which are known for their excellent fastness properties, including lightfastness and washfastness. The aldehyde group can be used to form the anthraquinone nucleus or to introduce substituents that modify the dye's color and properties.
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Triphenylmethane Dyes
In the synthesis of triphenylmethane dyes, it can be used to form the central carbon atom of the triphenylmethane structure. The hydroxyl groups can be further modified to introduce color-imparting substituents.
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Other Dye Classes
The compound can also be used in the synthesis of other dye classes, such as indigoid dyes, xanthene dyes, and flavonoid dyes, by participating in reactions that form the characteristic chromophoric groups of these dyes.
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Significance
Significance
The ability to undergo a wide range of chemical reactions makes it a versatile intermediate for the synthesis of diverse dye structures. This versatility allows dye manufacturers to produce a variety of colors and shades to meet market demands.
Color Properties
The chromophoric groups formed through reactions involving 2,4-dihydroxybenzaldehyde are responsible for the intense and vibrant colors of the dyes. These groups absorb light in the visible spectrum, resulting in the characteristic hues of the dyes.
Fastness Properties
Dyes synthesized using it can exhibit excellent fastness properties, including resistance to fading, washing, and light exposure. This is crucial for applications in textiles, leather, and other materials where color durability is important.
Cost-Effectiveness
Using it as an intermediate can streamline dye synthesis routes, reducing the number of steps and improving overall efficiency. This can lead to cost savings in the production of dyes and make the dyeing process more economically viable.
Applications in Various Materials
Textiles: Dyes synthesized from 2,4-dihydroxybenzaldehyde are widely used in the textile industry to color fabrics, yarns, and fibers. They can provide a wide range of colors and shades, as well as excellent fastness properties, making them suitable for both natural and synthetic fibers.
Leather: In the leather industry, these dyes are used to color leather products, such as shoes, bags, and upholstery. The dyes can penetrate the leather fibers, resulting in a uniform and durable color.
Other Materials: The dyes can also be used in the coloring of other materials, such as paper, plastics, and cosmetics, where color and fastness properties are important.
adverse reaction
2,4-Dihydroxybenzaldehyde is a chemical substance with specific applications in industrial production, laboratory research, and other fields.
Skin adverse reactions
Irritation reaction: 2,4-Dihydroxybenzaldehyde is irritating to the skin, and direct contact may cause symptoms such as redness, itching, and pain on the skin. This irritating reaction is usually caused by direct contact between the substance and the skin, which disrupts the normal barrier function of the skin, leading to damage to skin cells and the occurrence of inflammatory reactions.
The effects of long-term exposure: Long term or repeated exposure to 2,4-Dihydroxybenzaldehyde may worsen skin damage and even lead to chronic skin inflammation. There are reports showing that if staff do not take appropriate protective measures, such as wearing protective gloves and clothing, when handling or operating the substance, redness and itching symptoms may occur quickly after skin contact. These symptoms can usually gradually alleviate after detachment from contact and appropriate treatment, but long-term or repeated exposure may persist or worsen skin problems.
Adverse reactions to the eyes
Irritation reaction: When 2,4-Dihydroxybenzaldehyde splashes into the eyes, it may cause severe eye irritation, manifested as symptoms such as redness, swelling, pain, tearing, and photophobia. The cornea and conjunctiva are the main sites of action for this substance, which are rich in nerve endings and blood vessels and are highly sensitive to chemicals. This substance may cause cell damage and inflammatory reactions by disrupting the cellular structure of the cornea and conjunctiva.
Potential damage: In severe cases, 2,4-Dihydroxybenzaldehyde may also cause corneal damage or visual impairment. A laboratory worker accidentally splashed the substance into their eyes while operating it, immediately causing severe eye pain and continuous tears. After emergency flushing and medical treatment, although the symptoms have been relieved, there is still slight damage to the cornea that needs some time to recover.
Respiratory system adverse reactions
Inhalation irritation: Inhalation of vapor or dust of 2,4-Dihydroxybenzaldehyde may have adverse effects on the respiratory system, leading to respiratory irritation and symptoms such as coughing, difficulty breathing, and chest tightness. When the concentration of this substance in the air reaches a certain level, inhalation may irritate the respiratory mucosa, causing mucosal congestion, edema, and increased secretion, leading to symptoms such as coughing and difficulty breathing.
Long term exposure risks: Long term exposure to the environment of 2,4-Dihydroxybenzaldehyde may lead to more severe respiratory diseases such as asthma or pulmonary edema. Factory workers who have been exposed to the substance for a long time have gradually developed symptoms of coughing and difficulty breathing. After diagnosis and treatment of occupational disease, it was diagnosed as occupational asthma, which is related to long-term inhalation of the substance.
Adverse reactions to the digestive system
Although 2,4-Dihydroxybenzaldehyde mainly enters the human body through skin contact and inhalation, ingestion or accidental ingestion of the substance may also have adverse effects on the digestive system. This may lead to symptoms such as nausea, vomiting, abdominal pain, diarrhea, and in severe cases, it may even cause gastrointestinal bleeding or perforation. Children may experience nausea, vomiting, and abdominal pain due to ingestion of the substance. After timely medical treatment, the symptoms were relieved, but the digestive mucosa still suffered some degree of damage. The mechanism of adverse reactions in the digestive system is related to the direct stimulation and damage of the substance to the gastrointestinal mucosa. After ingestion, the substance may irritate the digestive tract mucosa, causing congestion, edema, and erosion of the mucosa, leading to symptoms such as nausea, vomiting, and abdominal pain. In severe cases, it may also lead to serious complications such as gastrointestinal bleeding or perforation.
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