What is the exact role of NH4Cl (ammonium chloride) in aqueous barbier type reactions?

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Pavel Pazdera

It is stronger proton-donor than water. see doi:10.3390/61200964

Sameer Karpe

But is it possible to carry out a aqueous barbier type reactions in presence of any other stronger proton donor instead of NH4Cl (ammonium chloride).?

Ammonium chloride is the right acid as a buffer - not too strong, not too weak.

See

http://bilbo.chm.uri.edu/CHM112/tables/KaTable.htm