Reactions form predominately or exclusively one enantiomer. is the addition of a single oxygen atom to an alkene to form an epoxide. of an alkene forms an alkane by addition of h₂. is the addition of two hydroxy groups to a double forming, a 1,2-diol or glycol. cleavage of an alkene breaks both the σ and π bonds of the double bond to form two carbonyl groups. reactions form predominately or exclusively one constitutional isomer. dihydroxylation results when an alkene is treated kmno4 or oso4, where each reagent adds two oxygen atoms to the same side of the double bond.

1) Stereo-selective (or enantioselective) reactions form predominately or exclusively one enantiomer.

2) Epoxidation is the addition of a single oxygen atom to an alkene to form an epoxide.

3) Hydrogenation (or reduction) of an alkene forms an alkane by addition of H₂.

4) Dihydroxylation is the addition of two hydroxy groups to a double forming, a 1,2-diol or glycol.

5) oxidative cleavage of an alkene breaks both the σ and π bonds of the double bond to form two carbonyl groups.

6)  Regioselective reactions form predominately or exclusively one constitutional isomer.

7)  Syn dihydroxylation results when an alkene is treated KMnO4 or OsO4, where each reagent adds two oxygen atoms to the same side of the double bond.

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