Results 81 to 90 of about 5,382 (243)

Synthetic Studies Directed Toward Streptenol D: Enantioselective Preparation of the 3,5-diacetoxy-6\u3cem\u3eE\u3c/em\u3e,8\u3cem\u3eE\u3c/em\u3e-decadiene Segment [PDF]

open access: yes, 1998
The enantioselective preparation of 2-(3′R,5′R-diacetoxy-6E,8E-decadienyl)-1,3-dioxane, (+)-13, is described. This synthesis of the skeleton of streptenol D utilizes the ability of a diene-complexed (tricarbonyl)iron unit to serve as a protecting and ...
Dasgupta, Bireshwar, Donaldson, William
core   +1 more source

Glucopyranosylidene-Spiro-Thiazolinones: Synthetic Studies and Determination of Absolute Configuration by TDDFT-ECD Calculations [PDF]

open access: yes, 2017
Reactions of O-peracylated C-(1-bromo-β-d-glucopyranosyl)formamides with thioamides furnished the corresponding glucopyranosylidene-spiro-thiazolin-4-one.
Kun, Sándor   +4 more
core   +2 more sources

Kupfer(II)‐photokatalysierte Radikalannellierung von Nitroalkanen mit Alkenen oder Alkinen zur Synthese von Isoxazolinen und Isoxazolen

open access: yesAngewandte Chemie, Volume 137, Issue 37, September 8, 2025.
Wir stellen ein Cu(II)‐photokatalytisches Verfahren vor, bei dem handelsübliche Nitroalkane für die Synthese von Isoxazolinen und Isoxazolen aus Alkenen bzw. Alkinen verwendet werden. Detaillierte mechanistische Untersuchungen ergaben, dass der breite Substratbereich, der sowohl aktivierte als auch nicht aktivierte Alkene und Alkine umfasst, auf einen ...
Sunaina Sardana   +3 more
wiley   +1 more source

Cycloaddition reactions of nitrosoalkenes, azoalkenes and nitrile oxides mediated by hydrotalcite [PDF]

open access: yes, 2012
Mg:Al 3:1 hydrotalcite (Ht), used in catalytic quantities, promotes the generation of nitrosoalkenes, azoalkenes and nitrile oxides. These can be intercepted in situ by heterocycles and olefins in [4+2] and [3+2] cycloaddition reactions, producing ...
Lemos, A., Lourenço, J. P.
core  

Asymmetric Lewis acid-catalyzed 1,3-dipolar cycloadditions [PDF]

open access: yes, 2017
Highly tuned, one-point binding chiral iron and ruthenium complexes selectively coordinate and activate α,β-unsaturated aldehydes and ketones toward asymmetric catalytic Diels-Alder cycloaddition reactions.
Brinkmann, Yasmin   +3 more
core  

Ultrafine Bubbles (UFB) Alleviate Toxicity of Fluxametamide‐Based Insecticides to Nontarget Freshwater Species, Daphnia magna

open access: yesEnvironmental Quality Management, Volume 35, Issue 1, Fall 2025.
ABSTRACT Pesticide contamination in freshwater ecosystems poses a significant threat to water quality and aquatic life, potentially disrupting entire food webs. Fluxametamide (FMT), a novel insecticide regarded as safe for nontarget species, has not been extensively studied in aquatic environments, raising concerns about its potential toxicity to ...
Desty Pratiwi   +5 more
wiley   +1 more source

Orthogonal, metal-free surface modification by strain-promoted azide–alkyne and nitrile oxide–alkene/alkyne cycloadditions [PDF]

open access: yes, 2012
In this article we present a fast and efficient methodology for biochemical surface patterning under extremely mild conditions. Micropatterned azide/benzaldoxime-surfaces were prepared by microcontact printing of a heterobifunctional cyclooctyne oxime ...
Arlinghaus, Heinrich F   +6 more
core   +1 more source

Syntheses of Isoxazoline-Based Amino Acids by Cycloaddition of Nitrile Oxides and Their Conversion into Highly Functionalized Bioactive Amino Acid Derivatives [PDF]

open access: yes, 2012
The present account illustrates the syntheses of isoxazoline- based amino acids by the cycloaddition of 1,3-dipolar nitrile oxides to the C–C double bond of unsaturated amino acid derivatives, with focus on the regio- and stereoselectivities of the ...
Fülöp, Ferenc   +2 more
core  

Aryl nitrile oxide cycloaddition reactions in the presence of pinacol boronic acid ester

open access: yesBeilstein Journal of Organic Chemistry, 2012
An aryl substrate with dual functionality consisting of a nitrile oxide and a pinacolyl boronate ester was prepared by mild hypervalent iodine oxidation (diacetoxyiodobenzene) of the corresponding aldoxime, without decomposition of the boronate ...
Sarah L. Harding   +2 more
doaj   +1 more source

Синтез (2-фторфенил)-и (4-фторфенил)-(2-нитрометилциклопентил)метанонов как предшественников фторсодержащих простаноидов [PDF]

open access: yes, 2014
Осуществлен синтез новых фторсодержащих первичных нитросоединений ? (2-фторфенил) и (4-фторфенил)-(2-нитрометилциклопентил)метанонов посредством 1,4-присоединения нитрометана к 1-ацилциклопентенам, полученным в результате восстановительного расщепления ...
Антоневич, Инесса Петровна   +2 more
core  

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