2-Isobutylpyrazine
[CAS# 29460-92-2]

Identification

• Classification: Pharmaceutical intermediate >> Heterocyclic compound intermediate >> Piperazine
• Name: 2-Isobutylpyrazine
• Synonyms: 2-(2-methylpropyl)pyrazine
• Molecular Formula: C₈H₁₂N₂
• Molecular Weight: 136.19
• CAS Registry Number: 29460-92-2
• EC Number: 249-647-2
• SMILES: CC(C)CC1=NC=CN=C1

Properties

• Solubility: 2123 mg/L (25 °C water)
• Density: 1.0±0.1 g/cm³, Calc.^*
• Index of Refraction: 1.492, Calc.^*
• Melting point: 21.53 °C
• Boiling Point: 190.8±20.0 °C (760 mmHg), Calc.^*, 197.51 °C
• Flash Point: 70.8±13.4 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software.

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H302-H315-H319-H335
• Safety Statements: P261-P280-P301+P312-P305+P351+P338

Discovery and Applications

2-Isobutylpyrazine is an organic compound belonging to the pyrazine family, characterized by a five-membered ring containing two nitrogen atoms and various alkyl substituents. This compound has attracted considerable attention in the fields of chemistry, food science, and aroma research due to its distinctive flavor and aroma properties. The discovery of 2-isobutylpyrazine dates back to the mid-20th century when researchers began exploring the chemistry of pyrazines and their role in the flavor profiles of various foods.

The synthesis of 2-isobutylpyrazine typically involves the condensation of 2,3-dimethylpyrazine with isobutyraldehyde, a process that forms the characteristic alkyl-substituted pyrazine. Since its synthesis, 2-isobutylpyrazine has been studied extensively for its potential applications in the food and beverage industry. It is recognized for its earthy, roasted, and nutty aroma, which can significantly enhance the sensory qualities of various products.

One of the primary applications of 2-isobutylpyrazine is in the flavoring of food and beverages. It is particularly valued in the production of certain wines, coffee, and roasted nuts, where its presence contributes to the complex flavor profiles that consumers enjoy. In winemaking, 2-isobutylpyrazine is often associated with the varietal character of certain grape types, particularly Sauvignon Blanc, where it adds a distinctive green, herbaceous note. As such, winemakers carefully monitor the concentration of this compound to achieve the desired sensory attributes in their wines.

In addition to its role in the food industry, 2-isobutylpyrazine is employed in the fragrance industry for its unique scent profile. Its earthy and nutty notes make it a valuable component in the formulation of perfumes and scented products. Fragrance manufacturers utilize 2-isobutylpyrazine to create complex blends that evoke natural aromas, enhancing the overall sensory experience for consumers. This versatility allows the compound to be incorporated into a variety of products, including cosmetics, household cleaners, and personal care items.

The compound’s unique flavor and aroma characteristics have also sparked interest in the field of research focused on sensory perception. Studies have investigated how 2-isobutylpyrazine interacts with other flavor compounds and how it can be utilized to enhance or modify flavor profiles in culinary applications. Understanding the sensory properties of this compound can provide valuable insights into how flavors are perceived, paving the way for innovative product development in the food and fragrance sectors.

Moreover, 2-isobutylpyrazine has been studied for its potential applications in the agricultural sector. Research has suggested that the compound may play a role in plant defense mechanisms, with certain plants producing pyrazines as a response to environmental stressors. This aspect of 2-isobutylpyrazine warrants further investigation, as it could lead to the development of natural plant protection strategies that enhance crop resilience.

While 2-isobutylpyrazine exhibits numerous beneficial properties, it is essential to consider its safety and regulatory aspects. The food and beverage industry is governed by strict regulations regarding flavoring substances, and 2-isobutylpyrazine is no exception. Regulatory agencies evaluate the safety of flavor compounds to ensure they are safe for consumption at specified concentrations. As with any chemical substance, proper handling and adherence to guidelines are crucial to mitigate potential risks associated with exposure.

In conclusion, 2-isobutylpyrazine is a distinctive organic compound with significant applications in the food, beverage, and fragrance industries. Its unique flavor and aroma properties enhance the sensory qualities of various products, making it a valuable ingredient in culinary and fragrance formulations. As research continues to explore the potential applications and benefits of 2-isobutylpyrazine, its role in enhancing flavor, aroma, and plant defense mechanisms remains a topic of interest across multiple fields.

References

2024. Identification of volatile components in Carthamus tinctorius honey using widely-targeted volatilome, _Journal of Food Measurement and Characterization_, 18(6)
DOI: https://doi.org/10.1007/s11694-024-02529-3

2021, Pyrazines in Food, _Handbook of Dietary Phytochemicals_
DOI: https://doi.org/10.1007/978-981-15-4148-3_44

2018, Impact of Microwave-Assisted Heating on the pH Value, Color, and Flavor Compounds in Glucose-Ammonium Model System, _Food and Bioprocess Technology_, 11(3)
DOI: https://doi.org/10.1007/s11947-018-2093-6