Alkyl hydrogen atoms bonded to a carbon atom in a a (alpha) position relative to a carbonyl group display unusually high acidity.While the pK a values for alkyl C-H bonds is typically on the order of 40-50, pK a values for these alpha hydrogens is usually within the range of 19-20.lkyl hydrogen atoms bonded to a carbon atom in a a (alpha) position relative to a carbonyl group display unusually high acidity.
Adventures of Superman was the first television series featuring the comic book superhero Superman. The series, which was syndicated rather than being tied to a network, began filming in 1951, and was first aired on September 19, 1952. The final first-run episode was broadcast on April 28, 1958.
Check it all out below in the Supergirl Origins and Evolutions slideshow! The real world Supergirl origins lie in 1959. Created by writer Otto Binder and artist Al Plastino, Supergirl debuted in 1958âs Superman #123. She quickly proved to be popular with the comic book fans. Supergirl wasnât the first teenage girl version of a popular established male hero, but sheâs proven that she has staying power.