MORE THAN A CENTURY AFTER THE FREE RADICALS DISCOVERY: TRIPHENYLMETHYL – THE FIRST KNOWN FREE RADICAL (An undergraduate lecture experiment)
نویسنده
چکیده
Triphenylchloromethane (TPCM) is reduced by zinc in a benzene solution, giving an intense yellow solution of triphenylmethyl (TPM), the first known stable free radical. In the solution, the free radical is in equilibrium with the dimer – 3-diphenylmethylidene-6-triphenylmethylcyclohexa-1,4-diene. The reactivity of TPM is demonstrated in reactions with oxygen and iodine, using a purpose built reaction chamber. The products are triphenylmethylperoxyde and triphenyliodomethane (both are colorless).
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