Why not add a stoichemitric quantity of a dry ammonium salt (preferrably ammonium chloride) to the organic substance to be chlorinated, and pass dry
chlorine gas through the mix? Ammonium salts easily form nitrogen trichloride when chlorine gas comes in contact with them, and nitrogen trichloride
should be a great chlorinating agent. Basically, the ammonium chloride would be a "catalyst" that got used up in the reaction.
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