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The structure of vitamin B 12 was the first low-molecular weight natural product determined by x-ray analysis rather than by chemical degradation. Thus, while the structure of this novel type of complex biomolecule was established, its chemistry remained essentially unknown; exploration of this chemistry became one of the tasks of the vitamin's chemical synthesis.
The synthesis constitutes a formal total synthesis, since the research groups only prepared the known intermediate cobyric acid, whose chemical conversion to vitamin B 12 was previously reported. This synthesis of vitamin B 12 is of no practical consequence due to its length, taking 72 chemical steps and giving an overall chemical yield well ...
The following 10 pages are in this category, out of 10 total. ... Vitamin B12 deficiency; Vitamin B12 total synthesis This page was ...
A/D-corrin-ring closure by photochemical A/D-seco-corrin→corrin cycloisomerization, key step in the ETH Zurich A/D variant of the total synthesis of vitamin B 12 [3] In the early 1960s, having become Professor of General Organic Chemistry at ETH, Eschenmoser began work on what was the most complex natural product synthesized at the time ...
Robert Burns Woodward ForMemRS HonFRSE (April 10, 1917 – July 8, 1979) was an American organic chemist.He is considered by many to be the preeminent synthetic organic chemist of the twentieth century, [3] having made many key contributions to the subject, especially in the synthesis of complex natural products and the determination of their molecular structure.
The Getty Villa art museum is threatened by the flames of the wind-driven Palisades Fire in Pacific Palisades, California, Jan. 7, 2025. A fast-moving brushfire in a Los Angeles suburb burned ...
A DAY IN THE LIFE OF A DOMESTIC WORKER: CARIBBEAN IMMIGRANT WOMEN AND THE CAMPAIGN FOR FAIR LABOR STANDARDS (with related Policy Recommendations) By ARLENE M. ROBERTS, ESQ.
In molecular biology, the vitamin B12-binding domain is a protein domain which binds to cobalamin (vitamin B12). It can bind two different forms of the cobalamin cofactor, with cobalt bonded either to a methyl group (methylcobalamin) or to 5'-deoxyadenosine (adenosylcobalamin).
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