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DETERMINATION OF FREE PHENOL IN A—STAGE CURED ACETALDEHYDE PHENOLICRESIN

Zen Xiangxin  
Decant the upper layer of a mixture of C_6G_6:HC_2H_3O_2 (glacial):H_2O=5:5:1.Use only the clear portion as developer and resolve the phenolic resin in 11 fractions, on a cellulose plate(containing 10%CaSO_4).Remove the fraction with the maximum R_f and elute with ethyl alcohol. By examination with UV,IR and NMR,thevfraction is identi- fied as phenol whose concentration is determined by UV.
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