Results 61 to 70 of about 1,058 (166)

Regioselective Palladium(0)-Catalyzed Cross-Coupling Reactions of Brominated Furans, Thiophenes, Pyrroles and Selenophenes and Synthesis of N,O-Heterocycles by Cyclocondensations of Hydrazone and Oxime Dianions [PDF]

open access: yes
The main work focuses on Palladium chemistry in organic synthesis to give new methodologies for functionalization of heterocycles, such as, furan, thiophenes, pyrroles and selenophenes. In addition, the second part of this thesis is a contribution to the
Dang, Thanh Tung (gnd: 138415692)
core   +1 more source

Chemical constitutions in the Colour Index™: A century of colourant classification

open access: yesColoration Technology, Volume 141, Issue 4, Page 427-472, August 2025.
Abstract This article details how the Colour Index™ (CI) system categorises and unambiguously labels commercial dyes and pigments based upon their chemical constitutions. It outlines the current process by which colourants that are new to the market find a place within CI and acquire generic identifiers.
Andrew Towns
wiley   +1 more source

NUCLEOPHILIC PHOSPHINE ADDITION: EXPLORATION OF NOVEL ALKYNE TRANSFORMATIONS [PDF]

open access: yes, 2019
Nucleophilic phosphine catalysis has demonstrated its value in synthetic chemistry by allowing for mild carbon-carbon bond formation. Many phosphine-catalyzed reactions with electron-deficient alkynes have been reported in recent years, leading to an ...
pierce, brett
core   +1 more source

Efficient and Stereoselective Synthesis of (Z)‐2‐Oxazolines by Transition Metal‐Free Cycloisomerization of Internal Propargylic Amides in Hexafluoroisopropanol (HFIP)

open access: yesAsian Journal of Organic Chemistry, Volume 14, Issue 7, July 2025.
(Z)‐2‐oxazolines are available in a stereoselective fashion by cyclization of propargylic amides with internal triple bonds in the presence of HCl generated in situ from hexafluoroisopropanol (HFIP) and TMSCl. Response surface methodology was crucial to optimize the reaction conditions.
Nicholas Jankowski, Norbert Krause
wiley   +1 more source

Funktionalisierung von 6H-1,2-Oxazinen durch 1,3-dipolare Cycloadditionen und Halogenierungen [PDF]

open access: yes, 2001
6H-1,2-Oxazines were functionalised at the C-C double bond by 1,3-dipolar cycloadditions and halogenation reactions. The reactions were carried out with 6-ethoxy-3-phenyl-6H-1,2-oxazine, 6-ethoxy-3-ethoxycarbonyl-6H-1,2-oxazine and 6-ethoxy-3 ...
Schmidt, Elmar
core   +1 more source

Synthesis of Saturated Heterocycles via Metal-Catalyzed Formal Cycloaddition Reactions That Generate a C–N or C–O Bond [PDF]

open access: yes, 2017
In this section, the synthesis of saturated N- and O-heterocycles via formal cycloaddition is presented. The main focus is on metal-catalyzed reactions involving C–C or C–X σ bond cleavage in three- or four-membered rings.
Waser, Jérôme
core   +1 more source

Selective [3+2] and [3+3]-Cycloaddition Reactions of Nitrones [PDF]

open access: yes, 2012
Cationic chiral dirhodium(II,III) carboxamidates, obtained from the oxidation of the corresponding dirhodium(II,II) carboxamidates by nitrosonium salts, are efficient promoters in asymmetric Lewis acid catalyzed reactions.
Wang, Xiaochen
core  

The Synthesis and Transformation of Nitrones for Organic Synthesis [PDF]

open access: yes, 2020
Nitrones are important compounds and are highly useful in many aspects. The first part describes the methods for synthesis of nitrones, which are useful and environmentally friendly.
Imada, Yasushi, Murahashi, Shun-Ichi
core  

The Chemistry of Selenosilanes: A Topic Overview [PDF]

open access: yes
Selenium-containing molecules represent a valuable class of compounds with a variety of applications in chemical and biological fields. Selenated reagents are used as intermediates to introduce functional groups (e.g., double bonds) onto different ...
Capperucci, Antonella, Tanini, Damiano
core   +1 more source

Multivalent Aminoseptanose Mimetics by Copper-Catalyzed (3+2) Cycloadditions of Azidomethyl-Substituted Bicyclic 1,2-Oxazines [PDF]

open access: yes
Starting from readily available enantiopure azidomethyl-substituted bicyclic 1,2-oxazine derivatives and mono-, di- or trialkynes, their copper-catalyzed (3+2) cycloadditions furnished a series of 1,2,3-triazolyl-linked compounds in good yields.
Bouché, Léa   +2 more
core   +1 more source

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