Percent Composition: C 66.41%, H 4.83%, N 5.16%, O 23.59%
Literature References: Prepn: Brewster, J. Am. Chem. Soc.40, 1136 (1918).
Properties: Crystals from hot ethanol, mp 187°. Practically insol in petr ether, cold water, more sol in warm water. Sol in alcohol, ether, benzene. Incompatible with alkalies and alkaline solns which dissolve it with decompn. The alkaline soln gradually becomes blue when boiled, the blue color being discharged upon continued boiling and again produced upon cooling and exposure to air.
It is an esterification product of salicylic acid and paracetamol. It was marketed by Bayer under the brand name Salophen as an analgesic in the late 19th and early 20th centuries.
Action and uses
In a warm alkaline solution acetaminosalol is broken up into salicylic acid and paracetamol. It is decomposed in the intestines, even when given as an injection. It was used as a substitute for salicylic acid in acute rheumatism, and as an intestinal antiseptic. It was similarly effective and much safer than salol, another intestinal antiseptic commonly used at the time. The fact that it is tasteless renders it easy to administer.
Advertisement for early 20th century Bayer products, including Salophen
Journal of Organic Chemistry, 86(5), 4254-4261; 2021