. Currents in biochemical research, 1956; twenty-seven essays charting the present course of biochemical research and considering the intimate relationship of biochemistry to medicine, physiology, and biology. Biochemistry -- Research. ISOSOUALENE MONDON 1953 Fig. 2. Structural relation between squalene and lanosterol; A, cyclization of squalene according to Robinson (19); B, cyclization of squalene according to Woodward and Bloch (25); M, C: derived biologically from methyl and carboxyl carbon atoms of acetate, respec- tively. time had been established for 17 of the 27 carbon atoms in the ste
. Currents in biochemical research, 1956; twenty-seven essays charting the present course of biochemical research and considering the intimate relationship of biochemistry to medicine, physiology, and biology. Biochemistry -- Research. ISOSOUALENE MONDON 1953 Fig. 2. Structural relation between squalene and lanosterol; A, cyclization of squalene according to Robinson (19); B, cyclization of squalene according to Woodward and Bloch (25); M, C: derived biologically from methyl and carboxyl carbon atoms of acetate, respec- tively. time had been established for 17 of the 27 carbon atoms in the steroid molecule (9,26). Nevertheless, it was realized that this analytical information was too incomplete to restrict the number of possible cyclization mechanisms. Robinson's formulation had the virtue of rationalizing the presence of the angular methyl groups in the positions in which they appear in fact in all the steroids. On the other hand, to judge from the chemical behavior of the terpenes a ring closure along the suggested lines did not seem probable. For example, the acid-catalyzed transi- tion of an isoprene derivative to the cyclic isomer proceeds in 477. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Green, David Ezra, 1910-. New York, Interscience Publishers
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