Results 21 to 30 of about 2,741 (258)

Synthesis of 1,4-benzothiazinones from acylpyruvic acids or furan-2,3-diones and o-aminothiophenol

open access: yesBeilstein Journal of Organic Chemistry, 2020
Two synthetic approaches to enaminones fused to 1,4-benzothiazin-2-one moiety, which can be interesting in studies on biological activity, chemosensors, and fluorescence, were developed via the reaction of furan-2,3-diones or acylpyruvic acids in the ...
Ekaterina E. Stepanova   +2 more
doaj   +1 more source

Carbodiimides as catalysts for the reduction of CO2 with boranes [PDF]

open access: yes, 2018
Carbodiimides catalyse the reduction of CO2 with H-BBN and BH3·SMe2 under mild conditions to give mainly boron methoxide derivatives.
Ramos, Alberto   +11 more
core   +1 more source

Electrochemical Synthesis of Carbodiimides via Metal/Oxidant-Free Oxidative Cross-Coupling of Amines and Isocyanides [PDF]

open access: yes, 2020
This work discloses an electrochemical oxidative cross-coupling of amines with aryl and aliphatic isocyanides. In an undivided cell, the reaction proceeds without involving any transition-metal catalyst, oxidant, or toxic reagents providing carbodiimides
Ved Prakash Verma   +9 more
core   +1 more source

Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil

open access: yesScientific Reports, 2021
This study aimed to develop a facile synthesis procedure for heterogeneous catalysts based on organic guanidine derivatives superbases chemically grafted on silica-coated Fe3O4 magnetic nanoparticles.
Petre Chipurici   +10 more
doaj   +1 more source

New models for the study of the racemization mechanism of carbodiimides. Synthesis and structure (X-ray crystallography and H-1NMR) of cyclic carbodiimides [PDF]

open access: yes, 1996
The crystal and molecular structure of carbodiimides 2 (5,6,18,19-tetradehydro-5,12,13,18,25,26- hexahydrotetrabenzo[d,h,m,q][1,3,10,12]tetraazacyclooctadecine) and 3 (8,10,22,24-tetraazapentacyclo- [23.3.1.13,7.111,15.117,21]dotriaconta-1(29),3,5,7(32)
Server-Carrió, Juan   +7 more
core   +1 more source

Selenium-Containing Heterocycles from Isoselenocyanates: Cycloaddition of Carbodiimides to Selenazetidines [PDF]

open access: yes, 2005
The reactions of isoselenocyanates with carbodiimides in refluxing hexane afforded 1,3-selenazetidine-2,4-diimines 3a–3h by a [2+2] cycloaddition in moderate-to-good yields.
Heinz Heimgartner   +5 more
core   +1 more source

Solving the puzzling competition of the thermal C2–C6 vs Myers–Saito cyclization of enyne-carbodiimides

open access: yesBeilstein Journal of Organic Chemistry, 2016
The mechanism of the thermal cyclization of enyne-carbodiimides 7a–c has been studied computationally by applying the DFT method. The results indicate that enyne-carbodiimides preferentially follow the C2–C6 (Schmittel) cyclization pathway in a concerted
Anup Rana   +3 more
doaj   +1 more source

Synthesis and Photochemical Cyclization of a Novel Enyne-Carbodiimide

open access: yesMolecules, 2000
The triplet sensitized cyclization of enyne-carbodiimide 4 leads to efficient formation of indoloquinoline 5 with concomittant loss of a methyl group. The efficient loss of the methyl group was explained using AM1 semiempirical calculations.
Jens-Peter Steffen   +2 more
doaj   +1 more source

Calculation of global and local reactivity descriptors of carbodiimides, a DFT study [PDF]

open access: yes, 2017
Carbodiimides have been widely used for different purposes, such as an intermediary to form peptides bonds and esters, which have generated industrial, organic and biological applications.
Norma Flores-Holguin   +2 more
core   +1 more source

Correction to “Alkylaluminum Complexes as Precatalysts in Hydroboration of Nitriles and Carbodiimides” [PDF]

open access: yes, 2020
Correction to “Alkylaluminum Complexes as Precatalysts in Hydroboration of Nitriles and ...
Yi Ding (172783)   +5 more
core   +1 more source

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