Experimental Chemistry for Junior Students Pt. 4
Experimental Chemistry for Junior Students Pt. 4
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^ ' -s Salicine, Saligenine.
When saligenine is oxidised it gives first an aldehyde, which is identical with the oil ofmeculow sweet (Spircea Ulmaria\ and then salicylic acid. An aldehyde iden- tical with oil of meadow sweet is produced by an in- teresting reaction due to Reimar and Tiemann, which consists in heating sodium phenolate and excess of Hydroxybenzoic Adds, 3 19 caustic soda with chloroform, when the following re- action takes place : — CgHsONa + CHCI3 + sNaOH = C6H4(ONa)COH + sNaCl ...+ 2H2O.
The addition of an acid sets free the oil which is half aldehyde, half phenol, C6H4(OH)COH. On oxidation this gives salicylic acid.
Oil of Wintergreeriy or Gaultheria procumbens^ con- sists chiefly of methyl salicylate. This is readily saponified and the free acid obtained. Salicylic acid is easily acted on by the halogens, and mono- and di- iodo-salicylic acids can be obtained by the direct action of iodine. When the two former are carefully treated with caustic potash, iodine is replaced by hydroxyl.
What to read after Experimental Chemistry for Junior Students Pt. 4?
You can find similar books in the "Read Also" column, or choose other free books by James Emerson Reynolds to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
^ ' -s Salicine, Saligenine.
When saligenine is oxidised it gives first an aldehyde, which is identical with the oil ofmeculow sweet (Spircea Ulmaria\ and then salicylic acid. An aldehyde iden- tical with oil of meadow sweet is produced by an in- teresting reaction due to Reimar and Tiemann, which consists in heating sodium phenolate and excess of Hydroxybenzoic Adds, 3 19 caustic soda with chloroform, when the following re- action takes place : — CgHsONa + CHCI3 + sNaOH = C6H4(ONa)COH + sNaCl ...+ 2H2O.
The addition of an acid sets free the oil which is half aldehyde, half phenol, C6H4(OH)COH. On oxidation this gives salicylic acid.
Oil of Wintergreeriy or Gaultheria procumbens^ con- sists chiefly of methyl salicylate. This is readily saponified and the free acid obtained. Salicylic acid is easily acted on by the halogens, and mono- and di- iodo-salicylic acids can be obtained by the direct action of iodine. When the two former are carefully treated with caustic potash, iodine is replaced by hydroxyl.
What to read after Experimental Chemistry for Junior Students Pt. 4?
You can find similar books in the "Read Also" column, or choose other free books by James Emerson Reynolds to read onlineMoreLess
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