click below
click below
Normal Size Small Size show me how
O Chem jenk
Exam 2
| Question | Answer |
|---|---|
| Steric Hindrance | a decrease in reactivity from the presence of bulky groups at the site of a reaction |
| Does steric hindrance decrease nucleophilicity AND basicity? | No, basicity is not decreased by steric hindrance |
| polar protic solvents | capable of intermolecular hydrogen bonding. They contain either O-H or N-H |
| Cations and anions can both be solvated by protic/aprotic solvents? | Protic |
| Cations are solvated by... | ion-dipole interactions |
| Anions are solvated by... | hydrogen bonding |
| Nucleophilicity (increases/decreases) as you go down a column for polar protic solvents | increases. this is opposite of basicity |
| Polar aprotic solvents | exhibit dipole dipole interactions but can't hydrogen bond. solvate only cations |
| In polar aprotic solvents nucleophilicity (increases/decreases) as bascitiy increases | increases |
| SN1 stands for | substitution nucleophilic unimolecular (two step) |
| SN2 stands for | substitution nucleophilic bimolecular (one step) |
| concerted reaction | bond breaking adn bond making occur at the same time |
| frontside attacks (retain/change) configuration? | retain |
| backside attacks (retain/change) configuration? | change |
| frontside and backside attacks result in enantiomers/diasteriomers? | enantiomers |
| all SN2 reactions are front/backside? | backside attack |