February 2022

New solution-processable chrysene-basked deep-blue fluorescent dendrimers consisting of chrysene as a core end-capped by carbazole dendrons were designed, synthesized, and characterized. These dendrimers exhibit strong deep-blue emissions in solution or thin-film states with decent hole mobility and high thermal and electrochemical stability. They can be effectively used as nondoped emitters in organic light-emitting diodes (OLEDs). The nondoped OLEDs, which have a simple structure, showed good electroluminescence (EL) performance (luminance: 2334–2400 cd m–2; external quantum efficiency: 1.88-2.51%; turn-on voltage: 3.8–4.0 V) and deep-blue EL spectra (CIE y: 0.065–0.075) with a narrow full width at half maximum of 61–65 nm.

The palladium(II)-catalyzed carbonylation of alkenes presents one of most efficient methods for the synthesis of alkyl-substituted carbonyls and has received much attention. In this Account, we summarize our recent studies on the palladium-catalyzed intermolecular carbonylation-based 1,2-difunctionalization of alkenes, in which two strategies were involved: (1) a cooperative strategy involves the sequential iodine(III)-mediated alkene activation and palladium-catalyzed carbonylation, leading to the intermolecular β-oxy-, fluoro-, and azidocarbonylation of alkenes; (2) the classic strategy initiated by intermolecular nucleopalladation and carbonylation, including the asymmetric oxycarbonylation of alkenes. These methods provide a series of efficient approaches to synthesize β-functionalized aliphatic carboxylic derivatives.1 Introduction2 A Cooperative Strategy Involving Iodine(III)-Mediated Alkene Activation and Palladium-Catalyzed Carbonylation2.1 Intermolecular Oxycarbonylation of Alkenes2.2 Intermolecular Fluorocarbonylation of Alkenes2.3 Intermolecular Azidocarbonylation of Alkenes3 Intermolecular Aminocarbonylation of Alkenes Initiated by Aminopalladation4 Intermolecular Arylcarbonylation of Alkenes Initiated by Arylpalladation5 Intermolecular Enantioselective Oxycarbonylation of Alkenes Initiated by Oxypalladation6 Conclusion