Results 71 to 80 of about 4,131 (247)

Site‐Specific Surface Modification via Chemoselective Click Reactions on Cyclobutene‐Functionalized Monolayers

open access: yesChemistryOpen, Volume 15, Issue 4, April 2026.
ABSTRACT We report the first example of self‐assembled monolayers (SAMs) incorporating a cyclobutene‐substituted alkanethiol on a gold surface and the efficient modification of these monolayers via inverse electron‐demand Diels–Alder (IEDDA) cycloadditions.
Boone W. Evans   +5 more
wiley   +1 more source

Gold(I)-Catalyzed Aromatization: Expeditious Synthesis of Polyfunctionalized Naphthalenes

open access: yesiScience, 2019
Summary: A gold-catalyzed 6-endo-dig carbocyclization of alkyne with the pendent diazo group is reported. It provides an expeditious approach for the synthesis of multi-functionalized naphthalene derivatives under mild conditions.
Cheng Zhang   +7 more
doaj   +1 more source

Synthesis of Polyfunctionalized Pyrroles by a PPh3-Promoted Condensation Reaction Between Ammonium Acetate, Dialkyl Acetylenedicarboxylate and Arylglyoxals [PDF]

open access: yesIranian Journal of Chemistry & Chemical Engineering, 2017
A simple and efficient synthesis of some polyfunctionalized pyrrole derivatives by a triphenylphosphine-promoted condensation reaction between dialkyl acetylenedicarboxylates, arylglyoxals, and ammonium acetate is described.
Hossein Anaraki-Ardakani   +1 more
doaj  

Synthetic and theoretical studies of novel ring closure and ring opening reactions [PDF]

open access: yes, 2006
Ring closure and ring opening reactions are in many cases useful synthetic procedures in organic chemistry. They allow the preparation of complex molecules with high stereoselectivity and good yields. Mechanistic and theoretical studies have been carried
González Rosende, Mª Eugenia   +1 more
core   +1 more source

One-step synthesis of differently bis-functionalized isoxazoles by cycloaddition of carbamoylnitrile oxide with β-keto esters [PDF]

open access: yes, 2012
A new protocol for synthesizing different functionalized isoxazoles is provided. Carbamoylnitrile oxide generated from nitroisoxazolone underwent inverse electron-demand 1,3-dipolar cycloaddition with 1,3-dicarbonyl compounds in the presence of magnesium
975   +15 more
core   +1 more source

Enantioselective Rhodium‐Catalyzed Cycloisomerization of 1,5‐Bis(allenes) to Access 1,2‐cis‐Ethynyl‐ and Vinyl‐Substituted Five‐Membered (Hetero)Cycles

open access: yesAngewandte Chemie, Volume 137, Issue 40, September 26, 2025.
The enantioselective Rh‐catalyzed cycloisomerization of 1,5‐bis(allenes) is reported for the preparation of 1,2‐cis‐ethynyl‐ and vinyl‐substituted (hetero)cyclic products in high yields and with excellent diastereo‐ and enantioselectivities. This method leads to the preparation of a valuable chiral building block in organic synthesis including ...
Farhad Panahi   +3 more
wiley   +2 more sources

A modular approach to prepare enantioenriched cyclobutanes: synthesis of (+)-rumphellaone A [PDF]

open access: yes, 2019
A modular synthesis of enantioenriched polyfunctionalized cyclobutanes was developed that features an 8-aminoquinolinamide directed C–H arylation reaction. The C–H arylation products were derivatized through subsequent decarboxylative coupling processes.
Beck, Jordan C.   +3 more
core   +1 more source

Polyfunctionality of the English quantitative words

open access: yesJournal of Education Culture and Society, 2020
The article in question considers the functioning of quantitative units, their language and speech aspects. Introduction focuses upon the major items of paper – definition of numerals, words of weight and measure, aims, methods of investigation, empiric mate-rial applied, evolution modifications, and perspectives of further study.
openaire   +3 more sources

[Cp*Ru]-catalyzed selective coupling/hydrogenation [PDF]

open access: yes, 2015
International ...
Achard, Mathieu   +7 more
core   +3 more sources

Inverse electron-demand 1,3-dipolar cycloaddition of nitrile oxide with common nitriles leading to 3-functionalized 1,2,4-oxadiazoles [PDF]

open access: yes, 2011
A carbamoyl-substituted nitrile oxide was generated upon treatment of easily available 2-methyl-4-nitro-3-isoxazolin-5(2H)-one with THF (not dried); the reaction proceeded efficiently even in the absence of any special reagents and reaction conditions ...
1020   +15 more
core   +1 more source

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