# Which of the two O_2NCH_2CH_2O or CH_3CH_2O^- is expected to be more stable and why?

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Dave Share
Mar 9, 2018

${O}_{2} N C {H}_{2} C {H}_{2} O$. Also, I think it has a negative charge...so should be ${O}_{2} N C {H}_{2} C {H}_{2} {O}^{-}$

#### Explanation:

Both situations you are comparing this reactive species called an Ethoxide ion, which is the conjugate base of Ethanol. Ethanol is a terrible acid (as in, it is not an acid), so its conjugate base is really strong!

I'm talking about the $\ldots C {H}_{2} {O}^{-}$ part.

The oxygen in this is very reactive and is a strong nucleophile in part because it is loaded with electrons.

Carbon chains are generally electron donating groups, so they have a tendency in this situation to increase the reactivity of the $\ldots C {H}_{2} {O}^{-}$ part. I sort of envision this as the tide of electrons is being pushed toward the $\ldots C {H}_{2} {O}^{-}$ part, making it more reactive.

The NO2 group, however, is generally an electron withdrawing group, and the presence of this group will diminish the reactivity of the $\ldots C {H}_{2} {O}^{-}$ part. The tide of electrons are now not being pushed toward the $\ldots C {H}_{2} {O}^{-}$ part, but rather toward the NO2, and this diminishes the $\ldots C {H}_{2} {O}^{-}$ part's reactivity.

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