# Which one is the stronger base?

I'm studying Wolff-Kishner reduction and I don't understand why after this step the leaving group is $$\ce{OH-}$$ instead of $$\ce{^-HN-NH2}$$. I guess it's because hydroxide ion is less strong than the other although it would be useful to know if i can calculate pkb of diazanide (namely $$\ce{^-NH-NH2}$$) starting from data on hydrazine. Also I'm considering pkb of $$\ce{OH-}$$ equal to $$0$$ because it's acting as a base.

• It's rather called hydrazide. They're stronger bases then respective alkoxides (and OH-). – Mithoron Nov 22 '18 at 22:31
• A hydrazide is a derivative of a carboxylic acid [RC(=O)NHNH2]. A hydrazone is a derivative of a ketone [R2C=NNH2] or aldehyde [RHC=NNH2]. ;) – user55119 Nov 22 '18 at 23:11