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

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The discussion centers on the role of concentrated aqueous calcium chloride in the synthesis of esters, specifically its ability to remove excess ethanol by forming a complex. Participants noted that the interaction involves an association between hydroxyl groups and calcium ions, similar to the behavior observed with calcium hydroxide. The solubility of calcium hydroxide can be enhanced by sugar, which may also play a role in the esterification process.

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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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