Results 11 to 20 of about 138,145 (310)

Stereo-Aware Extension of HOSE Codes [PDF]

open access: yes, 2019
The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.Descriptions of molecular environments have many applications in chemoinformatics, including chemical shift
Johnson, Sean R., Kuhn, Stefan
core   +1 more source

Modifying the stereochemistry of an enzyme-catalyzed reaction by directed evolution [PDF]

open access: yes, 2003
Aldolases have potential as tools for the synthesis of stereochemically complex carbohydrates. Here, we show that directed evolution can be used to alter the stereochemical course of the reaction catalyzed by tagatose-1,6-bisphosphate aldolase.
A. Berry   +27 more
core   +2 more sources

A unique bacteriohopanetetrol stereoisomer of marine anammox [PDF]

open access: yes, 2020
Anaerobic ammonium oxidation (anammox) is a major process of bioavailable nitrogen removal from marine systems. Previously, a bacteriohopanetetrol (BHT) isomer, with unknown stereochemistry, eluting later than BHT using high performance liquid ...
Alex Charlton, E.   +14 more
core   +6 more sources

Atropselective syntheses of (-) and (+) rugulotrosin A utilizing point-to-axial chirality transfer [PDF]

open access: yes, 2015
Chiral, dimeric natural products containing complex structures and interesting biological properties have inspired chemists and biologists for decades.
A Zask   +53 more
core   +2 more sources

X-ray Diffraction, Electronic Circular Dichroism, and Quantum Mechanics (TD-DFT) Investigations on 4 Dehydroxyaltersolanol A, a Secondary Metabolite from Endophytic Fungus Nigrospora oryzae [PDF]

open access: yesResearch Journal of Pharmacognosy
Background and objectives: A tetrahydro anthraquinone derivative, 4-dehydroxyaltersolanol A, has been obtained from Nigrospora oryzae, which was isolated from Uncaria borneensis Havil as an endophytic fungus.
Fatimah Bebe Mohamed Hussain   +8 more
doaj   +1 more source

Mannich base-connected syntheses mediated by ortho-quinone methides

open access: yesBeilstein Journal of Organic Chemistry, 2018
This article provides an overview about specifically modified Mannich reactions where the process involves an ortho-quinone methide (o-QM) intermediate.
Petra Barta   +2 more
doaj   +1 more source

The Metallacyclopentane-Olefin Interchange Reaction [PDF]

open access: yes, 1977
Tris(triphenylphosphine)tetramethylenenickel(II) and biscyclopentadienyltetramethylenetitanium, prepared from the reaction of a 1,4-dilithiobutane and the transition metal dihalides react with olefins to produce substituted metallacyclopentanes; the ...
Grubbs, Robert H., Miyashita, Akira
core   +1 more source

Contribution of the Chemistry Institutes to the Early Development of Stereochemistry

open access: yesCHIMIA, 2009
This article is a translation from German of a paper submitted by Kurt Hermann to the University of Zurich Prize committee in 1968, with additional editing by Jay Siegel.
Kurt Hermann
doaj   +1 more source

Nucleophilic Substitution at Heteroatoms—Identity Substitution Reactions at Phosphorus and Sulfur Centers: Do They Proceed in a Concerted (SN2) or Stepwise (A–E) Way?

open access: yesMolecules, 2022
The mechanisms of three selected identity substitution reactions at phosphorus and sulfur occurring with stereospecific inversion have been investigated using density functional theory (DFT).
Marian Mikołajczyk   +3 more
doaj   +1 more source

DESIGN OF AN EDUCATIONAL GAME AND ITS USE IN A TEAM GAME TOURNAMENT AS A STRATEGY TO ENGAGE STUDENTS IN REVIEWING STEREOCHEMISTRY CONCEPTS [PDF]

open access: yesQuímica Nova
This paper presents a Chemistry Team Game Tournament (TGT) as a didactic strategy to review stereochemistry concepts. For this purpose, a multilingual (English, Italian, French, and Portuguese) educational game, Stereochemistry Race, was developed on the
José Nunes da Silva Júnior   +8 more
doaj   +1 more source

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