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Hans Freiherr [a] von Pechmann (1 April 1850 – 19 April 1902) was a German chemist, renowned for his discovery of diazomethane in 1894. [ 1 ] [ 2 ] Pechmann condensation [ 3 ] [ 4 ] and Pechmann pyrazole synthesis . [ 5 ]
Hans von Pechmann: Chemist, renowned for his discovery of diazomethane in 1894. Pechmann condensation and Pechmann pyrazole synthesis. Julius Richard Petri: Bacteriologist who is generally credited with inventing the Petri dish while working as assistant to Robert Koch. Emil Pfeiffer: Discovery of Infectious mononucleosis
The Pechmann condensation is a synthesis of coumarins, ... It was discovered by the German chemist Hans von Pechmann [2]. Mechanism
1898: Synthesis of polyethylene, the most common plastic, by Hans von Pechmann [159] 1898: First synthesis of purine by Emil Fischer. He had also coined the word in 1884. [160] Early 20th century: Schlenk flask by Wilhelm Schlenk [161] 1900s: Haber process by Carl Bosch and Fritz Haber [133] 1902: Ostwald process by Wilhelm Ostwald [162]
Adolf von Baeyer Otto Bayer demonstrated in 1952 his invention Polyurethan Friedrich Bergius Carl Bosch Eduard Buchner Robert Wilhelm Bunsen. Lambert Heinrich von Babo; Manfred Baerns
Two German chemists also preceded Schlotterbeck in discovery of the reaction, Hans von Pechmann in 1895 and Viktor Meyer in 1905. [4] [5] The reaction has since been extended to the synthesis of β-keto esters from the condensation between aldehydes and diazo esters. [6] The general reaction scheme is as follows: General Scheme for Buchner Reaction
Hans von Pechmann, chemist; Corps Isaria München [218] Elias Peissner, Professor at Union College; Corps Palatia München, Corps Alemannia München; member of Sigma Phi and Phi Beta Kappa Society, fallen in the Battle of Chancellorsville [219]
Pechman or Pechmann is a surname of German origin. Notable people with that name include: Joseph A. Pechman (1918–1989), American economist; Hans von Pechmann (1850–1902), German chemist; Marsha J. Pechman (born 1951), American judge; Matthias Pechmann, East German swimmer