A rhodium-catalyzed annulation between ethyl benzimidates and α- aroyl sulfur ylides was developed, affording a series of pyrano[4,3,2-ij]isoquinoline derivatives in moderate to good yields with functional group compatibility. The procedure featured dual ortho-C–H functionalization cyclization one pot. optoelectronic properties those fused heteroarenes were tested by UV/vis fluorescence spectrometers.

The study of the formation, characterization, and functionality isolated surface hydrides on solid materials is a formidable task because complexity surfaces difficulty analyzing structures in solids. Herein, we found formation indium (In) hydride species supported by CHA zeolites. In were formed treatment an In-exchanged zeolite (In-CHA) with H2 at high temperatures (>773 K). situ Fourier transform infrared (FTIR) spectroscopy density functional theory (DFT) calculations revealed that...

Sulfoxonium ylides are a special type of sulfur that serve as new C1 or C2 synthons recently developed for use in C–H functionalization to access acylmethylated cyclized compounds through the formation metal carbene species. Many excellent works have reported syntheses various useful skeletons from these versatile synthons. These developments not previously been completely investigated reviewed. In this review, we summarize recent advances α-carbonyl sulfoxonium functionalizations, including...

A rhodium-catalyzed annulation between aroyl sulfoxonium ylides and anthranils has been developed to synthesize 10H-indolo[1,2-a]indol-10-one derivatives. This reaction started with an unpredented (4 + 1) toward N-(2-formylphenyl) indolones, proceeding the sequential ortho-amination of C–H bond in by insertion N–H carbene. Finally, Aldol condensation constructed second indole ring. procedure features formation two C–N bonds one C═C pot.

In this paper, we report a mild and practical method for precise deuteration of aliphatic carboxylic acids by synergistic photoredox HAT catalysis. The reaction delivers excellent D-incorporation (up to 99%) at predicted sites even in substrates bearing reactive C-H bonds or versatile functional groups. use recirculation reactor with peristaltic pump supports scalable preparative ability 50 mmol) under very conditions. readily available complex makes protocol promising the preparation...

Intelligent education research has become a hotspot in recent years. The Citespace software that operates graph visualization function was used to clarify the current situation, hot spots, and evolutionary trends of intelligent development; authors, institutions, countries engaged research, as well basic knowledge structure, main keywords, citation clustering, dual-map overlay journals emergence research. results show annual number publications field shown an upward trend since 2010, with...

To better understand the latest developments in global science, technology, engineering, and mathematics (STEM) education research, this study collected STEM research materials to sort out development of as a whole, so get clearer path trend development. This conducted visualization quantitative analysis literature on Science Citation Index Extended (SCI-E) Social (SSCI) using CiteSpace (5.8.R3) tool. First, basic information was analyzed terms annual publication volume, authors, countries,...

We use a recurrent neural network method, the Long Short-term Memory model, to tackle challenges posed by high-dimensional data when jointly forecasting conditional second moments of eight national stock indices and testing international Capital Asset Pricing Model. The results show that price world covariance risk is positive significant across global equity markets indicate increasing integration each country's market with U.S. market. Furthermore, portfolio optimization using LSTM...

This paper aims to investigate the relationship between social support and rural teachers' work engagement while exploring mediating effect of mindfulness in teaching moderating psychological safety. A sample 866 teachers was recruited, order complete Mindfulness Teaching Scale, Social Support Rating Psychological Safety Utrecht Work Engagement Scale. The study findings indicate that: (1) positively influenced teachers; (2) further, partially mediated on engagement; (3) safety moderated...

As a new generation of assessment instrument, cognitive diagnosis integrates the measurement objectives into model to diagnose fine-grained knowledge students. Taking PISA 2012 dataset in mathematics from Shanghai, Hong Kong, Macau and Taiwan as research subject, this study constructed with attributes Mathematical Abstraction, Logical Reasoning, Modeling, Intuitive Imagination, Operation Data Analysis, made an analysis mastery students’ mathematical competencies different four regions,...

This empirical study establishes a seamless integrated project-based learning framework mediated by an evidence-based system. Combining theoretical model construction and practical application, this research aims to bridge gaps in objectives, processes, resources, assessments. The employs conceptual clusters, problem chains, evidence-driven task design foster the development of interdisciplinary competency. A 40 h case study, centered on “Interior Space Design Teachers’ Apartments” project,...

A Rh-catalyzed annulation between 2-aryl-1H-benzo[d]imidazoles and α-aroyl sulfoxonium ylides was developed, affording a series of benzimidazo[2,1-a]isoquinolines in moderate to excellent yields. This procedure proceeded with the sequential ortho-C–H functionalization cyclization, representing facile straightforward pathway access such frameworks.

As one of the most influential international large-scale educational assessments, Program for International Student Assessment (PISA) provides a valuable platform horizontal comparisons and references education. The cognitive diagnostic model, newly generated evaluation theory, can integrate measurement goals into process model through analysis, which better understanding mastery students fine-grained knowledge points. On basis mathematical framework PISA 2012, 11 attributes have been formed...

Abstract A Rh‐catalyzed unique and direct approach for constructing a series of 5‐arylimidazo[1,2‐ c ]quinazolines in moderate to excellent yields from simple readily available 2‐arylimidazoles 3‐phenyl‐1,4,2‐dioxazol‐5‐ones was described. This procedure proceeds with sequential ortho ‐C−H bond amidation cyclization, which represents facile straightforward pathway access such frameworks. magnified image

The emergence of artificial intelligence has made adaptive learning possible, but building an system requires a comprehensive understanding students’ cognition. cognitive model provides crucial theoretical framework to explore attributes, making it vital for assessment and learning. This study investigates 52 experts, including primary secondary school teachers, mathematics education graduate students, based on the 16 attributes in TIMSS 2015 framework. Through analysis their attribute...

The level of difficulty mathematical test items is a critical aspect for evaluating quality and educational outcomes. Accurately predicting item during creation thus significantly important producing effective papers. This study used more than ten years content score data from China’s Henan Provincial College Entrance Examination in Mathematics as an evaluation criterion difficulty, all were obtained the Department Education. Based on framework established by National Center Education...

Open AccessCCS ChemistryRESEARCH ARTICLE14 Jul 2022Decarboxylative Acylation of Carboxylic Acids: Reaction Investigation and Mechanistic Study Xiaopeng Wu†, Jie Han†, Siyu Xia, Weipeng Li, Chengjian Zhu Jin Xie Wu† State Key Laboratory Coordination Chemistry, Jiangsu Advanced Organic Materials, Chemistry Biomedicine Innovation Center (ChemBIC), School Chemical Engineering, Nanjing University, 210023 , Han† Xia Li *Corresponding authors: E-mail Address: [email protected] Organometallic...