High Quality Dibenzo-18-crown-6 with CAS Number 14187-32-7 is a well - known macrocyclic polyether compound. It features a unique cyclic structure composed of repeating ether units. The molecular formula of Dibenzo-18-crown-6 is C₂₀H₂₄O₆, and it has a molecular weight of approximately 360.4 g/mol. Its melting point typically lies in the range of 162 - 164 °C.
This compound is known for its high purity, which ensures reliable performance in various applications. The high - quality version offered has been carefully synthesized and refined to meet strict quality standards, with minimal impurities that could interfere with its intended functions.
Dibenzo-18-crown-6 is widely used in the field of organic chemistry as a phase - transfer catalyst. It can facilitate the transfer of metal cations between two immiscible phases, such as between an aqueous phase and an organic phase. This property is particularly useful in SN₂ reactions, where it can enhance reaction rates and yields by solvating metal cations and making the anionic reactants more reactive.
It is also employed in the field of analytical chemistry for the extraction and separation of metal ions. Due to its specific cavity size and electron - rich oxygen atoms, it can selectively bind certain metal ions, allowing for their separation from other metal ions in a mixture.
In addition, in the area of supramolecular chemistry, Dibenzo-18-crown-6 serves as a building block for the construction of more complex molecular architectures. It can form host - guest complexes with various guest molecules, which have potential applications in areas such as molecular recognition and sensing.
When using Dibenzo-18-crown-6 as a phase - transfer catalyst, first, prepare the reaction mixture in a suitable reaction vessel. Add the appropriate amount of the substrate, the base, and the solvent. The amount of Dibenzo-18-crown-6 used usually depends on the nature of the reaction and the amount of substrate. A typical amount is in the range of 1 - 10 mol% relative to the substrate. Then, add the crown ether to the reaction mixture and stir the mixture at the appropriate temperature for a sufficient period to allow the reaction to proceed.
For metal ion extraction, dissolve Dibenzo-18-crown-6 in an organic solvent, such as dichloromethane or toluene. Then, add the aqueous solution containing the metal ions to be extracted. Shake the two - phase system thoroughly to allow the crown ether to complex with the metal ions in the aqueous phase and transfer them to the organic phase. Separate the organic phase and further process it to obtain the extracted metal ions.
In a research project focused on the synthesis of a specific organic compound, the use of Dibenzo-18-crown-6 as a phase - transfer catalyst significantly improved the reaction efficiency. The reaction between an alkyl halide and a nucleophile in a two - phase system (water and an organic solvent) was extremely slow without the catalyst. However, when 5 mol% of Dibenzo-18-crown-6 was added, the reaction rate increased by a factor of 5, and the yield of the desired product increased from 30% to over 80% within the same reaction time.
In an environmental analysis project, Dibenzo-18-crown-6 was used for the extraction of cesium ions from contaminated water samples. By dissolving the crown ether in an organic solvent and mixing it with the water sample, over 90% of the cesium ions were successfully extracted into the organic phase. This allowed for accurate quantification of cesium ions in the water samples, which was crucial for assessing the level of contamination.
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