نتایج جستجو برای: stereochemistry
تعداد نتایج: 3446 فیلتر نتایج به سال:
I am still impressed that the textbook language of organic chemistry is so successful in explaining the reactions that we find in nature. Thismight not have been anticipated because we find that biological reactions are invariably stereospecific whereas nonbiological reactions are invariably not. This realization came to light about 150 years ago when Pasteur found that only half of chemically ...
Nogalamycin is an anthracycline antibiotic produced by Streptomyces nogalater. Its aglycone has a unique stereochemistry (7S, 9S, 10R) compared to that of most other anthracyclines (7S, 9R, 10R). The gene snoaL, encoding a nogalonic acid methyl ester cyclase for nogalamycin, was used to generate nogalamycinone, demonstrating that the single cyclase dictates the C-9 stereochemistry of anthracycl...
The absolute stereochemistry of blumenol C glucoside and byzantionoside B was revised here as (6R,9S)- and (6R,9R)-9-hydroxymegastigman-4-en-3-one 9-O-beta-D-glucopyranosides, respectively, by modified Mosher's method. The empirical rules of (13)C-NMR chemical shift to determine the absolute stereochemistry of C-9 of 9-hydroxymegastigmane 9-O-beta-D-glucopyranoside were also discussed.
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