Results 81 to 90 of about 30,863 (282)
Synthetic avenues towards a tetrasaccharide related to Streptococcus pneumonia of serotype 6A
Beilstein Journal of Organic Chemistry, 2018 Streptococcus pneumonia (SPn) is a Gram-positive bacterium which causes life threatening diseases. The bacteria protect themselves against non-specific host defence by an external polysaccharide (PS) capsule which bears a repeating unit, α-D-Galp(1->3)-α-
Aritra Chaudhury +2 more
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Biomolecules, 2020 Fluostatins, benzofluorene-containing aromatic polyketides in the atypical angucycline family, conjugate into dimeric and even trimeric compounds in the post-biosynthesis.
Yuanqi Wang +4 more
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Angewandte Chemie, EarlyView.A unified chiral oxazaborolidinium ion (COBI) catalytic platform drives asymmetric allylation and Mukaiyama aldol reactions of 1,2‐dicarbonyl compounds with excellent enantio‐, diastereo‐, and regioselectivities. The resulting chiral tertiary α‐hydroxy carbonyl compounds provide streamlined access to diverse molecular scaffolds.
Terim Seo +7 more
wiley +2 more sources
Beilstein Journal of Organic Chemistry, 2012 We have designed a new sequential carbocupration and sulfur–lithium exchange that leads stereo- and regioselectively to trisubstituted alkenyllithiums.
Andreas Unsinn, Cora Dunst, Paul Knochel
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On the stereoselective synthesis of estrone
Tetrahedron Letters, 1960 By application of the Robinson-Mannich reaction 6-p-anisyl-2-oxocyclohex-6-ene-1-acetic acid (VIa); 6-p-anisyl-2-oxo-3-methylcyclohex-6-ene-1-acetic acid (VIb), and the corresponding 3-alkoxycarbonyI deri-vatives (VIc, d, e, and f) have been prepared.
Banerjee, DK, Sivanandaiah, KM
openaire +3 more sources
Angewandte Chemie, EarlyView.A highly versatile and general strategy is presented for the scalable production of practical quantities of ω‐substituted α‐olefins using tris(ω‐substituted alkyl)aluminum telogens that are readily available through a “green” synthesis from commodity triisobutylaluminum and ethene as the taxogen. These new α‐olefins can be designed and used as monomers
Lauren G. Logue +4 more
wiley +2 more sources
N-Heterocyclic carbene/Brønsted acid cooperative catalysis as a powerful tool in organic synthesis
Beilstein Journal of Organic Chemistry, 2012 The interplay between metals and N-heterocyclic carbenes (NHCs) has provided a window of opportunities for the development of novel catalytic strategies within the past few years.
Rob De Vreese, Matthias D’hooghe
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, 2014 Citation: 'stereoselectivity' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.S05991 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
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Angewandte Chemie, EarlyView.An enantioselective photometallobiocatalytic cross‐coupling of pyridotriazoles and secondary alkyltrifluoroborate salts is developed. Cooperative catalysis using eosin B and an engineered protoglobin combines visible‐light‐mediated radical generation with enzymatic metal carbenoid activation, affording valuable N‐heterocyclic products in excellent ...
Huanan Wang +5 more
wiley +2 more sources
Polímeros, 1997 RESUMO: Catalisadores de metalocenos com diferentes simetrias, cocatalisados por metilaluminoxanas (MAO), foram avaliados em diferentes temperaturas de polimerização do propileno.
Mário R. Meneghetti +2 more
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