. . "Pechmann, Hans Von"@en . . "German chemist" . "1850Z"^^ . . "1902-04-19Z"^^ . . "Hans von Pechmann (N\u00FCrnberg, 1 April 1850 - T\u00FCbingen, 19 April 1902) was a German chemist, renowned for his discovery of diazomethane in 1894. Pechmann condensation and Pechmann pyrazole synthesis."@en . "Hans von Pechmann"@en . . . . . "1902Z"^^ . . "1850-04-01Z"^^ .