The SN1 reaction is an organic reaction in chemistry. "SN" stands for substitution nucleophilic and the "1" represents the fact that the rate-determining step take place on the first order, that is it happens with only one molecule. Increasing or decreasing the concentration of that kind of molecule in a closed system changes the rate of the reaction in a direct relationship.
The SN1 reaction takes place in two steps:
- Changing the carbon centre:
- Deprotonation: Removal of a proton on the protonated nucleophile by a molecule (sometimes the same species as A) in the solvent, usually protic.
- C(CH3)3Br --> C(CH3)3+ + Br-
- C(CH3)3+ + OH- --> C(CH3)3OH
- C(CH3)3Br + OH- --> C(CH3)3OH + Br-
- rate = k[RX]