Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"Carbodiimides"”.
-
Synthesis of benzocarbazoles, indoloquinolines and indolonaphthridines from thermolysis of benzoenynyl ketenimines and carbodiimides
… (enyne-ketenimines) and N-[2-(1-alkynyl)phenyl]carbodiimides (enyne-carbodiimides) and their subsequent thermal behavior are described. Like enyne-allene and enyne-ketene systems, these enyne-hetereocumulenes undergo cycloaromatization through two competing biradical mechanisms under thermal …
-
Synthesis of o-isotoluenes, o-quinodimethanes, and benzoenynyl carbodiimides and their cyclizations to polycyclic and heterocyclic compounds
… from N-[2-(1-alkynyl)- phenyl]-N'-phenylcarbodiimides via a thermally-induced biradical-forming reaction. The Pd-catalyzed cross-coupling reaction between methyl 2-iodobenzoate and 1-alkynes furnished methyl 2-(1-alkynyl)benzoates, which were hydrolyzed to afford the corresponding benzoic …
-
Preparation of benzoenyne -allenes, enyne -isocyanates and enyne -carbodiimides and their applications in the synthesis of polycyclic aromatic hydrocarbons and heterocycles
… cyclopentene-based enyne-isocyanates and enyne-carbodiimides underwent predominately C 2-C7 cyclization pathway. The existence of intramolecular decay routes for the initially formed biradicals or zwitterions made these cyclization reactions essentially useful, leading to a variety of polycyclic …
-
Development of a Diastereoselective [4+2]-Annulation of Vinyl Carbodiimides With Chiral N-Alkyl Imines and Its Application to the Synthesis of the Batzelladine Alkaloids: Total Synthesis of (+)-Batzelladine a and (-)-Batzelladine D
A diastereoselective [4+2] annulation of vinyl carbodiimides with chiral N-alkyl imines has been developed to access the stereochemically rich anti-fused polycyclic guanidine cores of the batzelladine alkaloids. Application of this strategy, together with additional key steps such as a long-range …
-
Synthesis and Determination of the Absolute Configuration of the Bicyclic Guanidine Core of Batzelladine A and the Development of a Novel [4+2] Inverse Electron Demand Hetero Diels -Alder Cycloaddition and Its Application Toward the Synthesis of the Tricyclic Guanidine Fragment Within Batzelladine A
… cycloaddition between alpha,beta-unsaturated carbodiimides and cyclic thioimidates for access to functionalized guanidines which were shown to be possible advanced intermediates for the functionalized tricyclic guanidine contained within batzelladine A.
-
DESIGN OF HIGH-YIELDING NON-ENZYMATIC DNA AND RNA LIGATION SYSTEMS
… species such as imidazole and water soluble carbodiimides have been proposed as means for ligation. However, obtaining the activating agents by a prebiotic route is an active area of research with no consensus yet on an exact pathway. Cyclic phosphate intermediates offer a potential route to …
-
Studies of alkali metal compounds in diesel fuel and small molecule activation chemistry
… NMR spectroscopic studies. Finally, extension to carbodiimides and phosphine oxide molecules revealed attack at the front of the alkali metal NacNac complex, contrasting with the backbone γ-carbon attack seen with isocyanates and CO2.
-
Novel N-heterocyclic activations mediated by magnesium reagents having sterically hindered ligands
… to promote the hydroamination of isocyanates and carbodiimides, show that homoleptic [NaMg(CH2SiMe3)2] 32 can effectively catalyse at room temperature the reactions of HNPh2 with several aliphatic isocyanates to yield the relevant ureas [(NHR)C(=O)(NPh2)] (R = tBu, 29, R = Cy, 39, R = Et, 43) in …