- You can name an
alkyl
halide correctly using systematic (IUPAC) nomenclature, and can draw a
correct structure (including stereochemistry) for an alkyl halide from
its name.
- You
understand the impact of halogen electronegativity on molecular dipole
moment, and thus its effect on boiling points compared to the parent
hydrocarbon.
- You know
the mechanism for free-radical halogenation of alkanes, and can write
out the mechanism for any choice of specific alkane and halogen (cf.,
Chapter 3).
- You can
identify the two new reaction processes introduced in this and the next
chapter: substitution and elimination for alkyl halide reactants.
- You know
the distinction between a nucleophile and a base (as well as the
parallels).
- You
understand the essential pieces for an SN2
reaction: a one-step substitution mechanism in which a
nucleophile creates a new bond to carbon as the bond from carbon to a
leaving group breaks. You can use electron-pushing arrows to
depict the electron flow during this process, and identify nucleophile,
substrate, and leaving group.
Visualization:
Cyanide + MeBr
- You can
judge the relative nucleophilicity of any two nucleophiles based on
charge, polarizability, steric bulk, and solvent interactions.
Visualization:
Nucleophilicity scale
- You
understand how to identify likely substrates for SN2
substitution: methyl or primary; presence of a good leaving group
(not alkoxide or hydroxide or hydride), no other steric congestion of
the back side of the leaving group.
Visualization: Steric Bulk
- You
understand that the backside attack of the nucleophile leads to
inversion of stereochemistry, and can correctly show the stereochemical
outcome for any SN2 reaction.
- You can reason out the impact of changing solvent on a given SN2 reaction.
Solvent properties
Recommended
end-of-chapter problems: 6-31, 6-32, 6-38, 6-39, 6-41, 6-42, 6-45, 6-46, 6-57, 6-60.
Worked problems:
Worked Problem 1
Worked Problem 2
Worked Problem 3
Worked Problem 4
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