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Aldol Condensation Production of Pentaerythritol

I am stumped by a question from my textbook. The question reads: the compound pentaerythritol C(CH2OH)4 used in making explosives, is obtained from the reaction of acetalaldehyde and formaldehyde in the presence of Ca(OH)2. outline the probable steps in the structure. --- I think I know the final outcome I am having trouble with the steps to get to the final structure> Really need this one detailed so I can see where I may have gotten off the beaten path.

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Please the attached file for complete mechanism of this convesion.

This is a typical example of crossed aldol condensation. These reactons are called ...

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