Ag-Catalyzed Selective C-C Bond Activation of Cyclopropenones to Access α-Alkylidene Lactones.

A novel Ag-catalyzed ring opening of unsymmetric cyclopropenones for the stereoselective synthesis of a diverse range of α-alkylidene lactones has been developed. In this protocol, two different C-C(O) bonds were distinguished, demonstrating selective C-C bond activation. This reaction features a wide substrate scope, good functional group compatibility, and high atom economy, providing a versatile and general approach to the construction of α-alkylidene lactones.

Explosion in the preparation of nanoparticles: monodisperse Ag inserted in 3D graphene sheets for the electrochemical detection of HO.

In this work, the smashing effect of explosives innovatively led to the preparation of nanoparticles. The energetic material 3,5-dinitrobenzoic acid (DNBA) was introduced as a ligand to coordinate with silver ions and connect graphene sheets electrostatic attraction in the sol-gel process. Owing to the thermolysis of DNBA, the pore-formation of graphene sheets, thermal reduction of Ag and achievement of monodisperse Ag nanoparticles were realized simultaneously.

Photocatalyzed Csp-Csp cross-dehydrogenative coupling of -Boc-tetrahydroisoquinolines with α,β-unsaturated ketones.

A novel photocatalyzed cross-dehydrogenative coupling reaction of N-Boc-tetrahydroisoquinolines with α,β-unsaturated ketones has been developed. This research provides an easy access to a variety of C1-substituted tetrahydroisoquinolines, which can be further transformed into benzo[a]-quinolizine-2-ones, the skeletons of natural products with a wide range of biological activities. The load of the photocatalyst is low and the oxidant is inexpensive and less toxic.

A sandwich electrochemiluminescent assay for determination of concanavalin A with triple signal amplification based on MoSNF@MWCNTs modified electrode and Zn-MOF encapsulated luminol.

An ultrasensitive sandwich electrochemiluminescence (ECL) biosensor was designed for determination of concanavalin A (ConA) through the specific carbohydrate-ConA interactions. Three-dimensional porous metal-organic framework (Zn-MOF) was synthesized, which loaded a large amount of luminescent reagents as luminol by encapsulating into its pores to form Zn-MOF@luminol complex. Interestingly, Zn-MOF also acted as the coreactant accelerator in the luminol-HO ECL system.

Self-Catalyzing Chemiluminescence of Luminol-Diazonium Ion and Its Application for Catalyst-Free Hydrogen Peroxide Detection and Rat Arthritis Imaging.

We report the unique self-catalyzing chemiluminescence (CL) of luminol-diazonium ion (N-luminol) and its analytical potential. Visual CL emission was initially observed when N-luminol was subjected to alkaline aqueous HO without the aid of any catalysts. Further experimental investigations found peroxidase-like activity of N-luminol on the cleavage of HO into OH radical.