Electrophilic Addition: Mechanism and Regioselectivity

LGs 2.6 & 2.7

What kind of bond is the arrow pointing at?

Double Bond

What type of alkene is this?

Terminal Alkene

What type of alkene is this?

Internal Alkene

What type of alkene is this?

Cycloalkene

Among the Five Electrophilic Addition Reactions, what is this reaction?

Hydrohalogenation

Among the Five Electrophilic Addition Reactions, what is this reaction?

Hydration

Among the Five Electrophilic Addition Reactions, what is this reaction?

Halogenation

Among the Five Electrophilic Addition Reactions, what is this reaction?

Halohydrin Formation

Among the Five Electrophilic Addition Reactions, what is this reaction?

Hydroboration-oxidation

In organic compounds,  this is a polar reaction characterized by the incorporation of an electrophile to a carbon-carbon double bond to form a saturated product.

What does this description refer to?

Electrophilic Addition

•Every reaction of alkenes involves addition: the л bond is always broken.

•Because alkenes are electron rich, simple alkenes do not react with nucleophiles or bases, reagents that are themselves electron rich. Alkenes react with electrophiles.

Which among the Five Electrophilic Addition Reactions refers to the addition of hydrogen halides HX (X = Cl, Br, and I) to alkenes to form alkyl halides.

Hydrohalogenation

Which among the Five Electrophilic Addition Reactions refers to the Electrophilic Addition of HX?

Hydrohalogenation

Which among the Five Electrophilic Addition Reactions refers to the Electrophilic Addition of Water (H₂O)?

Hydration

Which among the Five Electrophilic Addition Reactions refers to the addition of water to an alkene to form an alcohol. H₂O itself is too weak an acid to protonate an alkene, but with added H₂SO₄, H₃O⁺ is formed and addition readily occurs.

Hydration

Which among the Five Electrophilic Addition Reactions refers to the addition of halogen X₂ (X = Cl or Br) to an alkene, forming a vicinal dihalide.

Halogenation

Which among the Five Electrophilic Addition Reactions refers to the treatment of an alkene with a halogen X₂ and H₂O forms a halohydrin by addition of the elements of X and OH to the double bond.

Halohydrin Formation

Which among the Five Electrophilic Addition Reactions converts an alkene to an alkylborane then into an alcohol

Hydroboration-oxibation

___________ occurs in chemical reactions where one reaction site is preferred over another?

Regioselectivity