Synonyms: phenylmethyl benzoatecas number: 120-51-4, molecular weight: 212.2, chemical formula: c14h12o2, einecs ec number: 204-402-9, fema: 2138, benzyl benzoate bp gradeph eurc14h12o2 -- 212.2 -- 120-51-4 definitionphenylmethyl benzoate.Content: 99.0 per cent to 100.5 per cent. Charactersappearance: colourless or almost colourless crystals or colourless or almost colourless, oily liquid.Solubility: practically insoluble in water, miscible with ethanol (96 per cent), with methylene chloride and with fatty and essential oils. Identificationfirst identification a.Second identification b, c.A. Infrared absorption spectrophotometry (2.2.24). Comparison ph. Eur. Reference spectrum of benzyl benzoate.B. To 2 g add 25 ml of alcoholic potassium hydroxide solution and boil under a reflux condenser for 2 h. Remove the ethanol on a water-bath, add 50 ml of water and distill. Collect about 25 ml of distillate and use it for identification test c. Acidify the liquid remaining in the distillation flask with dilute hydrochloric acid. A white precipitate is formed that, when washed with water and dried in vacuum melts at 121c to 124c.C. To the distillate obtained in identification test b add 2.5 g of potassium permanganate and 5 ml of dilute sodium hydroxide solution. Boil under a reflux condenser for 15 min, cool and filter. Acidify the filtrate with dilute hydrochloric acid. A white precipitate is formed that, when washed with water and dried in vacuum, melts at 121c to 124c. Testsacidity: dissolve 2.0 g in ethanol (96 per cent) r and dilute to 10 ml with the same solvent. Titrate with 0.1 m sodium hydroxide using phenolphthalein solution r as indicator. Not more than 0.2 ml is required to change the colour of the indicator to pink.Relative density: 1.118 to 1.122.Refractive index: 1.568 to 1.570.Freezing point: minimum 17.0c.
Upington, South Africa
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