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Question
Diphenyls are potential threat to the environment. How are these produced from arylhalides?
Solution
Diphenyl such as p,p ‘-dichlorodiphenyl trichloroethane (DDT) are posing serious environment problems because of its chemical stability and its fat solubility. Its residue accumulates in environment and its long-term effects could be highly dangerous.
Diphenyl can be prepared from aryl halides by the following two methods:
(i) Fittig reaction
(ii) Ullmann biaryl synthesis
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