Dicyclohexylcarbodiimide, with the CAS number 538 - 75 - 0, is a well - known and widely used organic compound. It is typically presented as a white to pale yellow crystalline solid at room temperature. The molecular formula of dicyclohexylcarbodiimide is C₁₃H₂₂N₂, and it has a molecular weight of approximately 206.33 g/mol. It has a melting point ranging from 34 - 35°C and a boiling point of around 122 - 124°C at 6 mmHg. The density of dicyclohexylcarbodiimide is about 0.965 g/mL at 25°C. It is insoluble in water but soluble in common organic solvents such as benzene, toluene, and chloroform.
Dicyclohexylcarbodiimide is primarily used as a coupling agent in organic synthesis. In peptide synthesis, it plays a crucial role in forming peptide bonds between amino acids. By activating the carboxyl group of one amino acid, it enables the reaction with the amino group of another amino acid, facilitating the formation of a peptide linkage. This is essential for the laboratory - scale production of peptides, which are important in various fields such as biochemistry, pharmacology, and biotechnology. Additionally, it can be used in the synthesis of esters, amides, and other organic compounds. In the pharmaceutical industry, it is used in the production of certain drugs to link different functional groups to form the desired chemical structures.
When using dicyclohexylcarbodiimide, it is important to work in a well - ventilated area due to its potential toxicity. First, dissolve the appropriate amount of the reactants in a suitable organic solvent. Then, add dicyclohexylcarbodiimide to the reaction mixture slowly under stirring. The reaction temperature should be carefully controlled according to the specific reaction requirements, usually at room temperature or slightly elevated temperatures. After the reaction is complete, the resulting dicyclohexylurea, which is a by - product, can be removed by filtration or other separation methods. It is also crucial to handle dicyclohexylcarbodiimide with appropriate protective equipment such as gloves and goggles to avoid skin and eye contact.
Case 1: Peptide Synthesis in a Research Laboratory
A research group was working on synthesizing a specific peptide for studying its biological activity. They used dicyclohexylcarbodiimide as the coupling agent. They first dissolved the protected amino acids in dichloromethane. After adding dicyclohexylcarbodiimide to the reaction mixture and stirring for several hours at room temperature, they successfully obtained the desired peptide with a high yield. The by - product dicyclohexylurea was removed by simple filtration, and the peptide was further purified by chromatography.
Caso 2: Síntese de um intermediário farmacêutico
A pharmaceutical company was synthesizing an intermediate for a new drug. Dicyclohexylcarbodiimide was used to form an amide bond between two key chemical moieties. By carefully controlling the reaction conditions, including the amount of dicyclohexylcarbodiimide, the reaction temperature, and the reaction time, they were able to produce the intermediate efficiently, which was then used in the subsequent steps of drug synthesis.
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