Abstract: Described herein are compositions of matter for novel universal dynamic crosslinkers (UDCs) and the shortest closed-loop process for upcycling of any plastics, including post-consumer plastic waste and immiscible plastic mixtures enabled by UDCs. We discovered that the specifically designed UDCs can dynamically crosslink any plastics, and more importantly mixed immiscible plastics into compatibilized living grafted multiblock copolymers. Our studies show that such UDCs can reactivate mixed plastic dead chains and dynamically crosslink them into compatibilized multiblock copolymers. The in situ generated dynamic thermosets exhibit intrinsic reprocessability as well as enhanced tensile strength and creep resistance, relative to virgin plastics. This approach avoids the need for de/reconstruction and thus provides the maximum recovery of the endowed energy and materials value of the individual plastics.

Abstract: The present disclosure provides compositions and methods for metathesizing a first alkenyl or alkynyl group with a second alkenyl or alkynyl group, the composition comprising a ruthenium metathesis catalyst and a photoredox catalyst that is activated by visible light.

Abstract: Methods for conversion of a broad range of amines to their 15N isotopic counterparts and the compounds produced thereby.

Abstract: Exemplary methods, catalysts, catalyst compositions and systems are provided to activate a latent ruthenium olefin metathesis catalyst using a deep red to near infrared light (e.g., 600-800 nm) in conjunction with an osmium (II) photocatalyst that is directly excited to its triplet state via spin-forbidden excitation. An excited state single electron reduction of a latent solvent coordinated, cationic pre-catalyst is proposed as the operating mechanism for activation and photocontrol, as probed via in situ LED NMR kinetic studies and cyclic voltammetry. Excellent levels of spatiotemporal control can be found under light irradiation. NIR olefin metathesis exhibits improved light penetration through barriers over lower wavelengths of light, a control element that was deployed to mold dicyclopentadiene via Ring Opening Metathesis Polymerization (ROMP).

Abstract: The present disclosure provides compositions and methods for metathesizing a first alkenyl or alkynyl group with a second alkenyl or alkynyl group, the composition comprising a ruthenium metathesis catalyst and a photoredox catalyst that is activated by visible light.

Abstract: The present disclosure provides compositions and methods for metathesizing a first alkenyl or alkynyl group with a second alkenyl or alkynyl group, the composition comprising a ruthenium metathesis catalyst and a photo-redox catalyst that is activated by infrared light.

Abstract: The present disclosure provides compositions and methods for metathesizing a first alkenyl or alkynyl group with a second alkenyl or alkynyl group, the composition comprising a ruthenium metathesis catalyst and a photoredox catalyst that is activated by visible light.

Abstract: Various exemplary photoreactions can be provided, including reactions generally based on triplet-triplet annihilation upconversion. Representative photosensitizers include PdPc(OBu)8 and PtTPTNP. Representative annihilators include FDPP and TTBP. Such exemplary photoreactions, systems and methods may be used in a variety of applications, including various biological or physical applications. Exemplary methods can also be provided for making or using such systems, photoreactions, kits including such systems, or the like.

Abstract: The present disclosure provides compositions and methods for metathesizing a first alkenyl or alkynyl group with a second alkenyl or alkynyl group, the composition comprising a ruthenium metathesis catalyst and a photoredox catalyst that is activated by visible light.

Abstract: Various exemplary photoreactions can be provided, including reactions generally based on triplet-triplet annihilation upconversion. Representative photosensitizers include PdPc(OBu)8 and PtTPTNP. Representative annihilators include FDPP and TTBP. Such exemplary photoreactions, systems and methods may be used in a variety of applications, including various biological or physical applications. Exemplary methods can also be provided for making or using such systems, photoreactions, kits including such systems, or the like.

Abstract: Provided herein are triazolium carbine catalysts useful for asymmetric hydration, fluorination, and deuteration, and processes for their preparation. Also provided are synthetic reactions in which these catalysts are used, in particular, in stereoselective formation of carbon-chlorine, carbon-hydrogen, carbon-fluorine, and carbon-deuterium bonds.

Abstract: Provided herein are chiral triazolium catalysts useful for asymmetric C—C bond formation and processes for their preparation. Also provided are synthetic reactions in which these catalysts are used, in particular, in asymmetric C—C bond formation.

Abstract: Provided herein are triazolium carbine catalysts useful for asymmetric hydration, fluorination, and deuteration, and processes for their preparation. Also provided are synthetic reactions in which these catalysts are used, in particular, in stereoselective formation of carbon-chlorine, carbon-hydrogen, carbon-fluorine, and carbon-deuterium bonds.