I am doing a Wittig and Horner-Wadsworth-Emmons experiment coming up and this is

Question

I am doing a Wittig and Horner-Wadsworth-Emmons experiment coming up and this is a question we have to answer: after the irradiation of the isomeric stilbenes in dichloromethane containing iodine is complete, the solution is washed with saturated sodium bisulfite. What is the purpose of this wash? I am doing a Wittig and Horner-Wadsworth-Emmons experiment coming up and this is a question we have to answer: after the irradiation of the isomeric stilbenes in dichloromethane containing iodine is complete, the solution is washed with saturated sodium bisulfite. What is the purpose of this wash?

Explanation / Answer

The main use of sodium bisulfite in organic synthesis is, it acts as a mild reducing agent, in organic synthesis using as a reducing agent in particular in purification procedures. It can efficiently remove traces or excess amounts of chlorine, bromine, iodine, hypochlorite salts, osmate esters, chromium trioxide and potassium permanganate. In given reaction for removal of traces or excess amounts iodine, it is required to use.

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