From α-keto acids to nitrile oxides enabled by copper nitrate: a facile access to fused isoxazolines

An unprecedented generation of nitrile oxides was developed from α-keto acids and copper nitrate through a novel carbon–carbon bond cleavage mode, affording pharmacologically interesting fused isoxazolines via 1,3-dipolar cycloadditions.

Rotaxane-Based Difunctional Nitrile N-Oxide Crosslinker: Synthesis and Direct Introduction of Movable Crosslinking Points into Ethylene-Propylene-Butadiene Monomer (EPDM) Rubber

Incorporation of rotaxane scaffolds into the crosslinking points of polymer networks significantly affects their rheological and mechanical properties. The present study involves the synthesis of a new rotaxane-type crosslinker containing nitrile N-oxide functional groups on both the axle and wheel components. The prepared crosslinker is highly reactive; however, it can be isolated and applied in the crosslinking reaction of a commercially important polymer, namely ethylene-propylene-butadiene monomer rubber (EPDM), in the absence of additives and catalysts. Tensile tests reveal that compared to a network containing conventional crosslinking points, both breaking strength and strain of the network structure prepared herein are improved due to the incorporation of movable crosslinking points. The synthesized network structure also exhibits five times higher fracture energy. The developed post-crosslinking methodology for the direct introduction of movable crosslinking points into pre-formed polymers will be valuable in the production of rotaxane materials for various applications.

Polyester nitrile N-oxides for click reactions synthesized with nitroalkane precursors as the initiator

Polyesters that have a nitrile N-oxide function at the initiation end were prepared and applied to a catalyst-free click reaction for star polymer synthesis.

Intramolecular geometry and intermolecular interactions of the CNO group of crystalline benzonitrile oxides: a comparison with phenyl cyanates, phenyl isocyanates, and phenyl azides

Crystal structures of four halogenated benzonitrile oxides allow intramolecular geometry and packing motif comparison with phenyl cyanates, isocyanates, and azides.

Metal-catalyzed 1,3-dipolar cycloaddition reactions of nitrile oxides

In this review recent advances in the metal-catalyzed 1,3-dipolar cycloaddition reactions of nitrile oxides are highlighted, covering references from the period 2000 until August 2018.

New synthetic route to OH-functionalized nitrile N-oxide and polyfunctional nitrile N-oxides for click crosslinking and decrosslinking of natural rubber

A new synthetic route for obtaining polyfunctional nitrile N-oxides from OH-tethering nitrile N-oxide is reported.

Preparation of a highly reactive polymer click reagent, PEG nitrile N-oxide, and its application in block and star polymer synthesis

The polymer nitrile N-oxide containing poly(ethylene glycol) (PEG) skeleton PEG-CNO was synthesized via a stepwise reaction.