A carbamoyl fluoride-enabled enantioselective Ni-catalyzed carbocarbamoylation of unactivated alkenes was developed, providing a broad range chiral γ-lactams bearing an all-carbon quaternary center in 45–96% yield and 38–97% ee.

We report a novel synthesis of phenanthridinones from N-methoxybenzamides using an oxidative C-H amidation reaction at room temperature in open air with modest to excellent yields. This method demonstrated unprecedented substrate scope. In particular, it solved the long-standing challenge sterically demanding substitutions.

We synthesized a composite material with hierarchical flower-like structure and extremely high enzyme activity found that the main factor affecting its catalytic was not actual weight percentage.

An efficient and direct ruthenium-catalyzed regioselective hydroxymethylation of (hetero)arenes via C–H activation with paraformaldehyde as a hydroxymethylating reagent is described. The corresponding products can be obtained in good to excellent yield. A number aryl aldehydes also used place giving the desired alcohol similarly results.

A palladium-catalyzed one-pot procedure for the synthesis of aryl ketones has been developed. Triazine esters when coupled with boronic acids provided in moderate to excellent yields (up 95%) presence 1 mol % Pd(PPh3)2Cl2 30 min.

The construction of 7-membered ring via direct C7-H cyclization benzoimidazoles with alkenes would provide a more atom- and step-economical route to tricyclic imidazoles derivatives that widely exist in broad range bioactive molecules. However, transition metal-catalyzed C-H for medium-ring synthesis has been limited reactive bonds, instead, the activation unreactive bonds towards medium still remains an elusive challenge. Herein, we report rings Ni-Al co-catalyzed alkenes, providing series...

Palladium-catalyzed syn-stereocontrolled ring-opening reactions of oxabenzonorbornadienes with a wide range sodium arylsulfinates were investigated, affording the desired products in good to excellent yields under an air atmosphere. This protocol provides low-cost new viable and convenient method toward synthesis cis-2-aryl-1,2-dihydronaphthalen-1-ol functional group tolerance. In addition, cis configuration 3da was established by X-ray diffraction analysis, plausible mechanism for reaction proposed.

Reconfigurable intelligent surfaces (RISs) are regarded as one of the most promising techniques in sixth-generation (6G) mobile communication networks. With feature smartly tuning electromagnetic environment, RISs provide a possibility for ubiquitous and high-precision localization 6G. However, proper system models large indoor RIS-assisted networks algorithms still missing. In this paper, we propose downlink millimeter-wave (mmWave) framework based on segment-by-segment far-field...

In daily life, speech is the main medium of human communication, and interpersonal communication emotional. People hope that computer can give a response based on emotions contained in voice. this paper, we build Wechat program emotion recognition system, which random forest classifier. Firstly, system preprocesses collected signals order to reduce noise. Secondly, 16 acoustic features are extracted from pre-processed signals. The obtains emotional by applying 12 statistical functions...

To address the need for massive connections in Internet-of-Vehicle communications, local wireless networks utilize non-orthogonal multiple access (NOMA). Scholars have introduced deep reinforcement learning user grouping and power allocation to reduce computational complexity. However, traditional algorithm based on DQN (Deep Q-Network) still exhibits slow convergence speed low training stability, while uniform sampling method sample playback process suffers from efficiency. In order these...

The gas-phase epoxidation of propylene and hydrogen peroxide (H2O2) vapor to produce oxide (G-HPPO) is a good way bypass the methanol solvent problem faced by liquid-phase HPPO process. In order quell decomposition H2O2 while promoting with at high temperature (e.g., 140 °C) condition generally needed for G-HPPO, an attempt grafting Ti atoms onto defective silicalite-1 (S-1) zeolite via chemical deposition (CVD) TiCl4 was made as unconventional route reach better catalyst than hydrothermally...

A novel method for the synthesis of 3-monohalooxindoles by acidolysis isatin-derived 3-phosphate-substituted oxindoles with haloid acids was developed. This synthetic strategy involved preparation oxindole intermediates and S N 1 reactions acids. new procedure features mild reaction conditions, simple operation, good yield, readily available inexpensive starting materials, gram-scalability.

In indoor low-light environments, the lack of light makes captured images often suffer from quality degradation problems, including missing features in dark areas, noise interference, low brightness, and contrast. Therefore, feature extraction algorithms are unable to extract information contained accurately, thereby hindering subsequent target search task this environment making it difficult determine location target. Aiming at problem, a joint local high-level semantic (JLHS) method is...

A series of trispiropyrrolidine bisoxindoles has been achieved via a three-component 1,3-dipolar cycloaddition reaction 3-aryl-5-arylmethylenespiro[indole-3′,2-[1,3]thiazolane]-2′(1H),4-dione, isatin, and sarcosine in refluxing toluene, which produced the corresponding cycloadducts good yields (79–88%). Their structures were determined by infrared, 1H 13C NMR, elementary analysis, single-crystal x-ray diffraction cycloaddtion was found to be highly regio- stereoselective.

The selectivity and reactivity to converse series nitroaromatic into aminobenzenes are especially significant, which play a vital role in synthesizing required drugs or other fine chemicals. Herein, p-nitrophenol (p-NP) has been completely conversed p-anomiphenol (p-AP) with high activity factor k (0.033 s−1·mg−1) reusability by core-shell Cu2[email protected]2 catalyst. N-acetyl-para-aminophenol (paracetamal, APAP) as model drug was further synthesized via flow route proceeded two steps...

The multi-walled carbon nanotubes (MWCNTs) /polyvinyl alcohol (PVA) coating may have excellent biocompatibility and unique electrical properties. effect of the dispersing agent on electrochemical behaviors is very relevant,which has a great influence ionic conductivity composite material.We prepared four membrane electrodes MWCNTs by using two processes electrophoretic deposition (EPD). scanning electron microscope (SEM) graphs MWCNTs/PVA were recorded In NaOH solution, glucose...

Sparse code multiple access (SCMA) is a new modulation and non-orthogonal scheme for 5G systems, in which the coded bits are mapped to multidimensional sparse codewords, message passing algorithm (MPA) employed detect multi-user signals. Device-to-Device communications underlaying cellular network also key technique networks; hence codes allocation between D2D users issue be studied. Based on short-range characteristics of communications, this paper proposes users. The proposed allocates...

The 2nd Joint Workshop on Cross Reality (JWCR'24), organized as part of ISMAR 2024, seeks to explore the burgeoning field (CR), which encompasses seamless integration and transition between various points reality-virtuality continuum (RVC) such Virtual (VR), Augmented Virtuality (AV), (AR). This hybrid workshop aims build upon foundation laid by inaugural JWCR at 2023, successfully unified diverse CR research communities. will address key themes including visualization, interaction, user...

Modulation classification is a key issue in non-cooperative communication systems, and signal constellation images can be used as input features of deep learning (DL) networks for classification. However, the conventional gray image cannot exactly reflect density location information points. To solve this problem, paper proposes gradient color (GCC) algorithm based on points, which converts points into data to realize its visualization, uses two network models, i.e., modified convolution...

Abstract To meet the demands of massive connections in Internet-of-vehicle communications, non-orthogonal multiple access (NOMA) is utilized local wireless networks. In NOMA technique, various optimization methods have been proposed to provide optimal resource allocation, but they are limited by computational complexity. Recently, deep reinforcement learning network for system, where a uniform sampled experience replay algorithm used reduce correlation between samples. However, sampling...

With the shrinking feature sizes of static random access memory-based field programmable gate arrays (FPGAs), occurrence probability multiple-cell upsets (MCUs) in FPGAs continues to increase. This reduces reliability FPGAs. article proposes an improved hybrid scrubbing scheme solve this problem. Based on conventional scheme, error detection process is by changing correction object from erroneous frame zone. MCUs can be rapidly corrected through continuous and zone correction. The...