In the synthesis of ester, how does conc. aqueos calcium chloride

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In the synthesis of esters, concentrated aqueous calcium chloride can effectively remove excess ethanol by forming a complex with it. This process involves an association between the hydroxyl group of ethanol and calcium ions. The discussion highlights that similar interactions occur with calcium hydroxide, which, despite its low solubility in water, can have its solubility significantly increased in the presence of sugar. The formation of these complexes is crucial in understanding how calcium chloride aids in the removal of ethanol during ester synthesis.
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In the synthesis of ester, how does conc. aqueos calcium chloride remove excess ethanol? I tried google, and found out that a complex is formed. How is this possible? If then what exactly is the complex formed? Thanks. :smile:
 
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Obviously some kind of association between the hydroxyl and the calcium ion. I've seen this kind of association with calcium hydroxide as well. Calcium hydroxide is not very soluble in water but sugar greatly enhances its solubility.
 

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