Search results
Results from the WOW.Com Content Network
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]
Pour le Mérite. The list contains recipients of the Pour le Mérite military class. Since the foundation, a total of 5,430 persons received this award. The Pour le Mérite was the Kingdom of Prussia's highest military order for officers until the end of World War I.
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]
The Pechmann condensation as applied to 7-hydroxy-4-methylcoumarin For coumarins unsubstituted at the 4-position, the method requires the use of formylacetic acid or ester. These are unstable and not commercially available, but the acid may be produced in situ from malic acid and sulfuric acid above 100 °C.
The German chemist Hans von Pechmann first synthesizes polyethylene while investigating diazomethane. [8] 20th Century. Year Event Reference 1907:
Diazomethane is an organic chemical compound with the formula CH 2 N 2, discovered by German chemist Hans von Pechmann in 1894. It is the simplest diazo compound.In the pure form at room temperature, it is an extremely sensitive explosive yellow gas; thus, it is almost universally used as a solution in diethyl ether.
PARIS (Reuters) - European Commission President Ursula von der Leyen delivered a speech on the European Union's AI aims at the Paris AI Summit on Tuesday. Below are some key quotes from her speech ...
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