Question

c. [3pts) The fuchsin reagent gives a red-violet color when it reacts with an aldehyde. Draw the intermediates of this reaction mechanism. RH SO3H SOH - 2 H20 - 2 H Y CH3 NH2 YCH HN A carbinolamine Diimine intermediate 2 H2SO3 SHP SOH OSN-H YCH F-8" Resonce structure showing extended coniugation of the cation (RED-VIOLET)

Answer 1

H HNGA 2H SOH CH3 NH2 Pro A Canbinelamune NO H- S03H Di,mene intermediate CH3 H

H Soyt -CH3 CH3 Red- velet

Carbinolamine is formed by the reaction of aldehyde to the given substrate, which leads to the formation of a bond between N of NH2 and carbonyl carbon.

2nd intermediate is formed by the protonation of diimine intermediate, on reaction with H2SO3.

3rd intermediate is a resonating structure of the cation already given in the reaction.

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