Rosenheim, Otto

Rosenheim, Otto, and Schidrowitz, Phillip. On some Analyses of Modern Dry Champagne. In the Analyst... 

Robert Robinson postulated that cholesterol is derived from the triterpene squalene (see the structure above). The correct structure of cholesterol (see chapter 2) was finally proven in 1932 by independent chemical studies by Wieland and Windaus and crystallographic studies by John Desmond ( J. D. ) Bernal (1901-70), Dorothy Crowfoot (1910-94 after 1937 Dorothy Crowfoot Hodgkin) and Otto Rosenheim (1871-1955). 

This material was also detectable in crude cholesterol from animals. Later it was found, that irradiation of ergosterol, a steroid from baker s yeast, led to a mixture of products with extraordinarily high anti-rachitic activity. At the end of the 1920s, Otto Rosenheim, Thomas Arthur Webster and Adolf Windaus succeeded, independently of each other, in isolating first the unpurified Vitamin D (Vitamin Dj, a mixture of ergocalciferol and lumisterolj) and later the pure crystalline Vitamin D (Vitamin D2, ergocalciferol). The structure determination followed by classical chemical degradation. 

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