MCAT O CHEM AAMC test

[PJS233006]

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[popopopop]

It's hard to explain through words. Mevalonate loses a carbon in a decarboxylation to form compound 3. The labeled CH3s with the asterisks are the carbons you want to follow. If you label all the carbons with the asterisks starting with reaction #2, you can clearly count the carbons.

 

[theonlytycrane]

question answered here: http://forums.studentdoctor.net/threads/aamc-unscored-38.1191909/#post-17600662

 

[PJS233006]

Thank you!!

 

[aldol16]

Always number your carbons in mechanisms. That helps you see what bonds are being formed and where.