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3-Bromobenzyl alcohol is an organic compound with a distinct chemical structure and properties. Its molecular formula is C7H7BrO, and it possesses a bromine atom attached to the third carbon of a benzyl group, which itself is derived from toluene by replacing the methyl group with a hydroxyl (alcohol) group. This specific arrangement of atoms gives it unique chemical characteristics and reactivity.
The compound appears as a colorless to light yellow liquid, exhibiting a moderate to low volatility. It is relatively stable under normal conditions but can undergo various chemical transformations due to the presence of the bromine atom and the hydroxyl group. The bromine substitution allows for further synthetic manipulations, such as cross-coupling reactions, while the hydroxyl group offers opportunities for esterification, etherification, and other alcohol-specific reactions.
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Chemical Formula |
C7H7BrO |
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Exact Mass |
185.97 |
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Molecular Weight |
187.04 |
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m/z |
185.97 (100.0%), 187.97 (97.3%), 186.97 (7.6%), 188.97 (7.4%) |
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Elemental Analysis |
C, 44.95; H, 3.77; Br, 42.72; O, 8.55 |
Fragrance Agent
3-Bromobenzyl alcohol serves as an excellent fixative in perfumes, playing a crucial role in stabilizing and enhancing the aroma of various fragrances. Its unique chemical properties allow it to blend seamlessly with other perfume components, creating long-lasting and complex scent profiles.
In the case of jasmine, night-blooming cereus, and ylang-ylang, it acts as a supportive note, helping to anchor the floral aromas and ensure they remain consistent and true throughout the fragrance's lifespan.
By stabilizing the volatile components of these fragrances, it ensures that the perfume retains its intended scent for a longer duration, enhancing the overall sensory experience.
Moreover, its ability to enhance the aroma contributes to creating a more nuanced and memorable fragrance, making it a highly valued ingredient in high-end perfumery. The use as a fixative underscores its versatility and importance in the perfume industry, where it continues to be a staple in the formulation of many popular and iconic fragrances.
The role in the synthesis of various perfume and essential oil components underscores its significance as a raw material in the perfume industry. Its chemical structure, which combines a bromine atom with a benzyl alcohol moiety, provides a versatile scaffold for the creation of new and complex aromatic molecules.
Through various chemical reactions, such as alkylation, arylation, and oxidation, it can be transformed into a multitude of perfume ingredients.
These reactions can modify the alcohol's aroma profile, creating new and diverse scent notes that can be blended into perfumes to achieve desired olfactory effects.
For example, the bromine atom can be replaced with other functional groups to generate compounds with unique fragrances. The benzyl alcohol moiety can also undergo reactions to introduce additional aromatic rings or functional groups, further expanding the range of possible scents.
Furthermore, its ability to stabilize and enhance the aroma of fragrances makes it an ideal candidate for use in essential oils. By incorporating it into the synthesis of essential oil components, perfumers can create blends that retain their aroma for longer periods, providing a more consistent and enjoyable sensory experience.
In summary, its contributions to the synthesis of perfume and essential oil components, combined with its stabilizing and enhancing properties, make it an indispensable raw material in the perfume industry. Its versatility and reactivity enable perfumers to create innovative and captivating fragrances that cater to diverse tastes and preferences.
Preparation of Cosmetics and Daily Chemical Products
In cosmetics, it can be used as a fragrance component, contributing to the overall aroma profile of various products. Its ability to blend seamlessly with other scent notes allows formulators to create complex and layered fragrances that cater to diverse tastes and preferences.
In soaps and other cleaning products, it can help to stabilize the fragrance components, ensuring that the scent remains consistent and pleasant throughout the product's usage. This is particularly important in liquid soaps and shower gels, where fragrance stability can be challenging due to the presence of surfactants and other formulation ingredients.
Moreover, its safety profile has been well-established through rigorous testing and regulatory approval. This ensures that consumers can use cosmetics and personal care products containing this ingredient with confidence, knowing that it is both effective and safe.
In summary, its ability to enhance and stabilize the aroma of cosmetics and daily chemical products, combined with its proven safety, makes it a valuable ingredient in the personal care industry. Its diverse applications and unique properties continue to drive its demand and usage in a wide range of consumer products.
Potential for Further Chemical Transformations
The bromine atom serves as a versatile point of attachment for various chemical reactions, enabling the conversion of this intermediate into a multitude of other functional groups. This transformation capability significantly expands the application potential across diverse fields.
For instance, the bromine atom can be replaced with other halogen atoms, such as chlorine or fluorine, through halogen exchange reactions. These halogenated derivatives can possess altered physical and chemical properties, making them suitable for use in different applications.
Alternatively, the bromine atom can be converted into hydroxyl, amino, or alkoxy groups through substitution reactions. These functional groups can impart unique properties to the resulting compounds, such as increased solubility, reactivity, or biological activity.
Moreover, the bromine atom can serve as a precursor for the introduction of aryl or alkenyl groups through cross-coupling reactions, such as the Suzuki-Miyaura or Heck reactions. These reactions allow for the synthesis of aromatic or alkenyl substituted benzyl alcohols, which can be further functionalized or incorporated into more complex molecules.
In addition to these transformations, the benzyl alcohol moiety itself can undergo reactions such as esterification, etherification, or oxidation, further diversifying the range of compounds that can be synthesized starting from 3-Bromobenzyl alcohol.
In summary, the bromine atom provides a versatile platform for the synthesis of a wide variety of functional groups, significantly expanding its application potential across diverse fields such as pharmaceuticals, materials science, and personal care products.
adverse reaction
The product is an important organic synthesis intermediate widely used in the fields of medicine, fragrance, and materials science. Its chemical properties are stable, but it may cause adverse reactions to the human body and the environment under specific conditions.
Acute toxic reaction
Oral toxicity
The product is classified as a hazardous chemical and may cause acute poisoning when taken orally. According to the classification criteria of the Safety Data Sheet (SDS), its hazard declaration includes H302 (Harmful if swallowed).
Animal experiments have shown that although the oral LD50 (median lethal dose) data of rats has not been fully disclosed, the LD50 of similar structural compounds (such as aromatic alcohols) is usually in the range of 1000-3000 mg/kg, indicating that they have certain toxicity. After oral administration, the compound may be absorbed through the gastrointestinal tract, causing digestive symptoms such as nausea, vomiting, abdominal pain, and in severe cases, may cause liver function damage or central nervous system suppression.
Toxicity in contact with skin and mucous membranes
Direct contact with it may cause skin and mucosal irritation. The hazard statements H315 (causing skin irritation) and H319 (causing severe eye irritation) clearly indicate their risks. After contact, the skin may experience redness, swelling, or burning sensation, while eye contact may lead to conjunctival congestion, tearing, and even corneal damage. Long term or repeated exposure may cause skin allergic reactions, such as contact dermatitis.
Inhalation toxicity
Inhaling the dust or vapor of this compound may cause irritation to the respiratory tract. Hazard statement H335 (may cause respiratory irritation) indicates that exposure to high concentrations may cause coughing, shortness of breath, or difficulty breathing. For individuals with asthma or chronic respiratory diseases, the risk may be higher.
The discovery of 3-bromobenzyl alcohol is inseparable from the gradual development of organobromine chemistry since the 19th century. After the French chemist Antoine Jérôme Balard formally discovered the element bromine in 1826, research on brominated compounds gradually emerged. Among them, brominated aromatic compounds became a research hotspot in the field of organic synthesis due to their unique chemical properties. In the early 20th century, with the initial maturity of organic synthesis technology, researchers began to systematically explore the combined effects of different substituents on the benzene ring. As common functional groups, hydroxyl and bromine atoms made their coexisting aromatic derivatives a research focus, laying a theoretical and practical foundation for the discovery of the product. During this period, benzyl alcohol derivatives had been proven to possess excellent reactivity, and the introduction of bromine atoms was expected to regulate their physicochemical properties, promoting the separation and synthesis research of related compounds.
The product was not initially discovered through deliberate synthesis, but was an accidental finding by researchers in the mid-20th century during studies on the reduction of bromobenzoate esters. In 1997, while isolating the reduction products of 3-bromobenzoate by Microbacterium desulfuricans, researchers clearly identified the product as an intermediate for the first time by comparing gas chromatography retention times, ultraviolet spectra and mass spectra, confirming that it could be generated via the reduction of bromobenzoate esters. Initially, it was only regarded as a by-product or intermediate in organic reactions and did not attract widespread attention. Researchers focused primarily on mechanistic studies of the reaction itself, without conducting in-depth investigations into the independent physicochemical properties and application value of this compound.
From the 1980s to the 1990s, with the rapid advancement of organic synthesis technology, research on the product entered a systematic stage. In 1989, a clear synthetic method was reported for the first time, providing technical support for subsequent studies. Using modern analytical techniques such as infrared spectroscopy, nuclear magnetic resonance and mass spectrometry, researchers accurately confirmed its molecular structure: a bromine atom attached to the 3-position of the benzene ring and a hydroxyl group at the benzyl position, with the molecular formula C₇H₇BrO, clarifying its core characteristics as a benzyl alcohol derivative. Meanwhile, researchers optimized the synthetic route and developed a highly efficient method using 3-bromobenzaldehyde as the raw material and sodium borohydride as the reducing agent, achieving a yield of up to 99.8%. A technological breakthrough was also made in preparing the compound from ester precursors via borohydride reduction, laying the groundwork for its large-scale production.
Since the 21st century, the discovery history of the product has entered a stage of value exploration. Researchers have gradually uncovered its distinctive chemical properties: the bromine atom can undergo coupling, alkylation and other reactions, while the hydroxyl group can be oxidized to aldehyde, carboxyl or halogenated groups, making it an important organic synthesis intermediate. In addition, its application in the synthesis of fragrances and flavors has been gradually developed, serving as a fixative for jasmine, tuberose, ylang-ylang and other essences, enriching the aromatic layers of perfumes. With further research, its potential value in pharmaceuticals, electronic chemicals and other fields has been further explored. Today, it has become an indispensable basic raw material in the fine chemical industry. Its discovery and development process also witness the leap of organobromine chemistry from basic research to practical applications.
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