para-toluenesulfonic acid

para-toluenesulfonic acid

[¦par·ə ¦täl·yə‚wēn¦səl¦fän·ik ′as·əd] (organic chemistry) C6H4(SO3H)(CH3) Toxic, colorless, combustible crystals soluble in water, alcohol, and ether; melts at 107°C; used in dyes and as a chemical intermediate and organic catalyst.