2,2' -dihydroxybiphenyl, also known as catechol, is an organic compound. The following is an introduction to its nature, use, manufacturing and safety information:
Nature:
- Appearance: 2,2' -dihydroxybiphenyl is white to light yellow crystal or crystalline powder;
- Solubility: it is almost insoluble in water, but soluble in organic solvents such as alcohols, ethers and ketones;
- Chemical properties: 2,2' -dihydroxybiphenyls have good oxidation-reducing properties and can participate in acylation, etherification or esterification reactions.
Purpose:
-2,2' -dihydroxy biphenyls are important intermediates of many organic compounds, which are widely used in dyes, fluorescent agents, photosensitive materials and other fields.
- It can be used as a starting material for the synthesis of polyimides, polyesters and other polymers.
Preparation:
The preparation methods of -2,2' -dihydroxybiphenyl mainly include phenolic method and phenol method.
-phenolic method: Reaction of phthalic anhydride with excess phenol under acid catalyst, then 2,2' -dihydroxybiphenyl was prepared through neutralization, precipitation and purification steps;
-phenol method: 2,2' -dihydroxy biphenyl is obtained by cyclization of benzene and excess phenol in the presence of catalyst.
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