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Von Pechmann was born in Nürnberg, the only son of a doctor, who was also named Hans.The von Pechmanns had distinguished themselves as soldiers; in 1702, von Pechmann's ancestor Martin Günther von Pechmann, a general of artillery in the Bavarian army, had been raised to the rank of a baron of the Holy Roman Empire by Leopold I. [6]
1898: Synthesis of polyethylene, the most common plastic, by Hans von Pechmann [160] 1898: First synthesis of purine by Emil Fischer. He had also coined the word in 1884. [161] Early 20th century: Schlenk flask by Wilhelm Schlenk [162] 1900s: Haber process by Carl Bosch and Fritz Haber [134] 1902: Ostwald process by Wilhelm Ostwald [163]
High-density polyethylene bottles are introduced; they will replace glass bottles in most applications. [11] 1965: Kevlar is developed at DuPont by Stephanie Kwolek: 1980s: Polyester film stock replaces cellulose acetate for photographic film and computer tapes. 1988: The first polymer bank notes are issued in Australia
Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.
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
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
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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
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