ABSTRACT We report the first Co(OAc) 2 ‐catalyzed transfer hydrogenative annulation of 2‐nitrobenzyl alcohols with primary and secondary alcohols for the synthesis of quinolines. The protocol operates with only 1 mol% catalyst under solvent‐free conditions, tolerates a broad range of substrates, and furnishes quinolines in up to 86% yield without external oxidants or reductants. A plausible reaction pathway for the synthesis of quinolines involving Co(OAc) 2 ‐catalyst via a tandem process has been clearly investigated.
ABSTRACT Metallo‐supramolecular polymers (MSPs) are coordination‐driven materials in which reversible metal–ligand interactions couple molecular design with redox‐active polymeric interfaces. This review critically examines their synthesis, physicochemical properties, interfacial charge‐transfer behavior, and emerging electrochemical sensing applications. Particular attention is given to how ligand denticity and conjugation, metal identity, mono‐ versus heterometallic organization, counterions, and film‐fabrication strategies regulate redox accessibility, conductivity, analyte adsorption, and electrocatalytic response. Terpyridine‐based MSPs provide the most developed sensing examples and illustrate how coordination‐driven self‐assembly can generate mono‐, bi‐, and trimetallic architectures with tunable electrochemical characteristics. Representative systems for nitrite, sulfite, bisphenol A, glucose, and Cr(VI) detection are compared with related MSPs platforms reported by different research groups to distinguish broadly applicable design principles from system‐specific observations. Rather than treating structural characterization as an end point, emphasis is placed on structure–property–performance relationships linking coordination environment and morphology to electron‐transfer kinetics and analytical response. Current limitations including the narrow diversity of sensing‐active ligand frameworks, modest intrinsic conductivity, mechanistic uncertainty, long‐term stability, and limited independent validation are critically assessed. Opportunities in ligand engineering, heterometallic programming, conductive hybrids, controlled film growth, and device integration are highlighted as directions for expanding MSP‐based electrochemical sensing beyond the presently limited material space.
ABSTRACT A Brønsted acid‐catalyzed regioselective [7+1] annulation of α ‐aryl‐ γ ‐( α ‐indolyl)phenols with aromatic aldehydes has been developed for the synthesis of indole‐fused eight‐membered oxacycles. In this transformation, α ‐aryl‐ γ ‐( α ‐indolyl)phenols function as 1,7‐bis‐nucleophiles, whereas aromatic aldehydes serve as readily available one‐carbon bis‐electrophiles. The reaction proceeds under metal‐free conditions with broad substrate scope, good functional‐group compatibility, and high regioselectivity. This protocol provides an efficient and practical approach to indole‐fused eight‐membered heterocycles and highlights the utility of aldehydes as versatile building blocks for medium‐sized ring synthesis.
ABSTRACT Diarylboron β ‐diketiminate complexes were synthesized through the complexation between β ‐diketimine and the corresponding triarylboranes. The crystal samples exhibited dual‐emission behavior, and the ratios of the two peaks varied with temperature. Temperature‐dependent photoluminescence (PL) spectroscopy suggested that the thermochromic luminescence properties observed in the crystalline state should originate from thermally activated delayed fluorescence (TADF). The results of photophysical measurements and density functional theory calculations implied that the intersystem crossing processes in this class of complexes should involve higher‐lying triplet excited states. The intensity ratio between shorter and longer wavelength PL bands showed an Arrhenius‐type relationship against temperature. Therefore, these complexes could be applied as a ratiometric luminescent thermometer.
ABSTRACT Transforming inorganic nitrogen source to complex organic compounds is a basic task in chemistry area. In this study, Rh(III)‐catalyzed multicomponent C─H activation and (4+2) annulation reactions of 1,3‐diketones, alkynes, and hydrazine hydrate have been disclosed, leading to neutral pyrazolo[5,1‐ a ]isoquinolines (PIQs, 3 ) and cationic PIQs ( 4 ) with good yields. The divergency is adjusted by the numbers of the C2‐substituents of 1,3‐diketones, enabling pyrazolo[5,1‐ a ]isoquinolin‐4‐ium cations ( 4 ) for the first time. Some key intermediates were successfully isolated and characterized by ESI‐MS to verify the mechanism. Furthermore, the photophysical properties of the resulting products have been characterized.
