This cyclization is an example of an intramolecular nucleophilic addition of an alcohol with an aldehyde.This process is catalyzed by mild acid.On the structures provided below draw arrows indicating electron flow in this reaction mechanism. 
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Q45: Compound U is an aldotetrose that can
Q46: Examine the following molecular models.Atoms other than
Q47: Exhibit 25-11
Consider the reaction below to answer
Q48: Exhibit 25-12
Below is the structure of the
Q49: For a hypothetical aldoheptose with 5 chirality
Q51: Exhibit 25-11
Consider the reaction below to answer
Q52: In comparing Fischer projections,which of the following
Q53: Examine the following molecular models.Atoms other than
Q54: Consider the following structure.Atoms other than carbon
Q55: Consider the following structure.Atoms other than carbon
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