General Properties of Terpene Phenols General Properties of Terpene Phenols

There are several characteristic features of terpene phenols which not only help them in their separation but also aid in their identification as stated below:
1. Bromine Reaction: Phenols react with bromine evolving the corresponding HBr. The resulting bromides are usually crystalline in nature and sparingly water-soluble. Hence, they may be separated easily and identified accordingly.
2. Reaction with Ferric Chloride: Phenols react with dilute aqueous solutions of ferric chloride (FeCl3) (0.1-0.2% w/v) to give rise to intense coloured reactions, which attributes to the specific colour-tests.
3. Formation of Phthaleins: Several phenols react with phthalic anhydride to form their
corresponding phthaleins.
4. Most phenols react with specific reagents, such as: acetic anhydride, benzoyl chloride, phenyl isocyanate and p-nitrobenzoyl chloride to give characteristic reaction products that also help in their identifications.

Source:Pharmacognosy And Pharmacobiotechnology By Ashutosh Kar

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