When phenol is treated with chcl3 and alkali if give salicylaldehyde the intermediate species of reaction-
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extinguish the fire by displacing oxygen in the surrounding air. Carbon Dioxide Extinguisher Page 16 • CO 2 is not suitable for fires involving metals. film forming concentrate in water which forms air foams when discharged through an aspirating nozzle.
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The negative charge is delocalised into the aromatic ring, making it far more nucleophilic. Nucleophilic attack of the dichlorocarbene gives an intermediate dichloromethyl substituted phenol (7). After basic hydrolysis, the desired product (9) is formed.
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