C7H7O3S
C7H7O3S is the molecular formula for several chemical compounds, most notably 4-toluenesulfonic acid and its isomers. 4-Toluenesulfonic acid, also known as p-toluenesulfonic acid or TsOH, is an organic sulfonic acid. It is a strong organic acid and a widely used catalyst in organic synthesis. Its chemical structure consists of a benzene ring substituted with a methyl group (CH3) and a sulfonic acid group (SO3H) at opposite positions (para).
The sulfonic acid group is highly polar and readily dissociates in water, making it a strong acid
Isomers of 4-toluenesulfonic acid also share the C7H7O3S formula but differ in the positions of the methyl