What starting compound(s) would you use in an aldol reaction to prepare 
Definitions:
Diastereomers
Non-mirror-image stereo isomers that have varying physical and chemical properties from each other.
Stereocenters
Chiral centers in a molecule, points at which the molecule can adopt different spatial arrangements leading to different stereoisomers.
Stereogenic Centers
Atoms within a molecule that are bonded to four different substituents, giving rise to stereoisomerism.
Diastereomers
Stereoisomers that are not mirror images of each other and possess different physical and chemical properties.
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