Isobutyl chloroformate with CAS number 543 - 27 - 1 is a chemical compound widely used in various industrial and laboratory settings. Its molecular formula is C₅H₉ClO₂, and it has a molecular weight of approximately 136.57 g/mol. This colorless to pale - yellow liquid has a pungent odor. It typically has a purity level that meets high - quality standards when sourced from a factory supply.
The boiling point of isobutyl chloroformate is around 105 - 106 °C, and its density is about 1.062 g/mL at 25 °C. It is slightly soluble in water but is miscible with many organic solvents such as ethanol, ether, and benzene. The refractive index of this compound is approximately 1.4085 at 20 °C.
Isobutyl chloroformate serves multiple important functions in different industries. In the pharmaceutical industry, it is a crucial intermediate in the synthesis of various drugs. It can be used to introduce the isobutoxycarbonyl group into molecules, which is often a key step in the production of active pharmaceutical ingredients. This helps in enhancing the stability and bioavailability of certain drugs.
In the field of organic synthesis, it is a valuable reagent for acylating amines, alcohols, and thiols. Acylation reactions are fundamental in the creation of complex organic compounds, and isobutyl chloroformate provides a reliable way to perform these transformations. It is also used in the preparation of carbamates, which have applications in pesticides and herbicides.
When using isobutyl chloroformate, strict safety precautions should be followed. First, it should be handled in a well - ventilated area, preferably under a fume hood, due to its pungent and potentially harmful vapors. Personal protective equipment such as safety goggles, gloves, and a lab coat should be worn at all times.
For acylation reactions, it is usually added slowly to a solution containing the substrate (amine, alcohol, or thiol) and a base. The base is used to neutralize the hydrogen chloride that is produced during the reaction. The reaction temperature and time should be carefully controlled according to the specific reaction requirements. After the reaction is complete, the product can be isolated and purified using standard organic chemistry techniques such as extraction, distillation, or chromatography.
Caso de síntese farmacêutica: A pharmaceutical company was synthesizing a new anti - inflammatory drug. They needed to introduce an isobutoxycarbonyl group to a key intermediate. They dissolved the intermediate in dry tetrahydrofuran (THF) and added triethylamine as a base. Then, isobutyl chloroformate was slowly added drop - wise to the solution at 0 °C. The reaction mixture was stirred for 2 hours at room temperature. After work - up and purification by column chromatography, they obtained the desired product with a high yield of 85%. This demonstrated the effectiveness of isobutyl chloroformate in pharmaceutical synthesis.
Organic Synthesis Case: In a research laboratory, chemists were trying to synthesize a novel carbamate compound for potential use in pesticides. They reacted an alcohol with isobutyl chloroformate in the presence of pyridine as a base. The reaction was carried out in dichloromethane at reflux temperature for 3 hours. After purification by distillation, they successfully obtained the carbamate product, which showed promising pesticidal activity in preliminary tests.
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Este é o William, Diretor Executivo da Zhishang Chemical Co., Ltd.
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