检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 2005年第12期24卷 1393-1396页

作者： SHI Da-Qing SHI Chun-Ling rong liang-ce Department of Chemistr） Xuzhou Normal University Xuzhou 221116 China The Key Laboratory of Biotechnology on Medical Plants of Jiangsu Province Xuzhou 221116 China

The title compound 1-（4-chlorophenyl）-2-cyano-3-amino-3a-hydroxy-3a,3b,6,7- tetrahydro-benzo[4,5]indene 2, has been synthesized by the reductive cyclization of 2-cyano-3- （4-chlorophenyl）-3-（1-tetralon-2-yl） propionitrile 1 induced by low-valent titanium reagent and its structure was determined by single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group C2/c with a = 28.244（7）, b = 14.401（3）, c = 21.245（3）A,β= 115.71（2）°, V = 7786（3）A^3, Mr= 696.13, Dc = 1.188 g/cm^3, Z = 8,μ（MoKα） = 0.208 mm^-1, F（000） = 2916, R = 0.0783 and wR = 0.2350. X-ray analysis reveals that the five-membered ring （C（7）～C（l l）） adopts an envelop conformation, while the six-membered ring （C（10）～C（14）, C（19）） has a half-chair conformation. Meanwhile, intermolecular H-bond interactions result in the formation of polymer.

关键词： tetrahydrobenzoindene synthesis crystal structure low-valent titanium

3-对甲氧基苯基-和3-对羟基苯基-1-氨基-3a,4,5,9b-四氢化-9b-羟基-3H-环戊烯并[a]萘-2-甲腈的合成和晶体结构

在线全文

学校读者我要写书评

暂无评论

有机化学 2005年第12期25卷 1560-1564页

作者：史达清荣良策王菊仙庄启亚徐州师范大学化学系徐州221116

用低价钛试剂(TiCl4-Zn)与2-氰基-3-对甲氧基苯基-3-(1-四氢萘酮-2-基)丙腈反应合成了3-对甲氧基苯基-1-氨基-3a,4,5,9b-四氢化-9b-羟基-3H-环戊烯并[a]萘-2-甲腈和3-对羟基苯基-1-氨基-3a,4,5,9b-四氢化-9b-羟基-3H-环戊烯并[a]萘-2-甲... 详细信息

关键词：低价钛环戊烯并[a]萘-2-甲腈合成晶体结构

Federated local causal structure learning

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年

作者： Kui YU Chen rong Hao WANG Fuyuan CAO Jiye liang School of Computer and Information Hefei University of Technology School of Computer and Information Technology Shanxi University

Local causal structure learning (LCS) efficiently identifies a set of direct neighbors of a specified variable from observational data. Additionally, it distinguishes direct causes and direct effects of this variable without learning the entire causal structure. While many LCS algorithms have been proposed, they do not consider the data privacy-preserving problem,which has attracted extensive attention from academia and industry. To address this issue, we propose a federated local causal structure learning (FedLCS) algorithm to learn local causal structures in privacy-preserving data in a federated ***, FedLCS introduces a layer-wise federated local skeleton learning algorithm to construct the local skeleton. Based on this skeleton, it introduces a federated local skeleton orientation algorithm and an extension-and-backtracking orientation algorithm to orient the edges. Finally, FedLCS uses a federated local extension-and-backtracking orientation algorithm to orient the remaining edges. Extensive experiments on benchmark, synthetic, and real datasets demonstrate that FedLCS can learn the local causal structure of a given variable in a federated setting.

关键词：

无溶剂、无催化剂条件下合成1，4，5，6，7，8-六氢喹啉-5-酮衍生物

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

有机化学 2008年第5期28卷 837-840页

作者：荣良策韩红霞姜虹庄启亚姚昌盛屠树江徐州师范大学化学化工学院徐州221116 江苏省药用植物生物技术重点实验室徐州221116

无溶剂、无催化剂条件,在NH4OAc存在下以查尔酮和1,3-二酮为原料,高产率地合成1,4,5,6,7,8-六氢喹啉-5-酮衍生物.该方法具有反应条件温和、操作简单和环境友好等优点.并通过IR,1H NMR,元素分析和X衍射确证产物的结构.

关键词： 1,3-环己二酮查尔酮无溶剂合成 1,4,5,6,7,8-六氢喹啉-5-酮

环己酮与查尔酮的无溶剂Michael加成反应

在线全文

学校读者我要写书评

暂无评论

有机化学 2007年第10期27卷 1292-1295页

作者：荣良策李小跃王海营史达清屠树江徐州师范大学化学系徐州221116

以环己酮和查尔酮为原料,在NaOH存在下无溶剂室温研磨反应,非常方便地得到Michael加成产物.该方法具有反应条件温和、操作简单和产率较高等优点,并通过IR,1H NMR和元素分析确证产物的结构.

关键词：环己酮查尔酮 Michael加成无溶剂

无溶剂条件下合成2-[3-氧代-1,3-二(未)取代苯基丙基]-1,2,3,4-四氢萘-1-酮

在线全文

学校读者我要写书评

暂无评论

有机化学 2008年第4期28卷 746-749页

作者：荣良策韩红霞蒋虹李小跃姚昌盛屠树江徐州师范大学化学化工学院江苏省药用植物生物技术重点实验室徐州221116 江苏省药用植物生物技术重点实验室

以3,4-二氢-1-萘酮和查尔酮为原料,在K2CO3-NaOH存在下,无溶剂室温研磨反应,方便地得到2-[3-氧代-1,3-二(未)取代苯基丙基]-1,2,3,4-四氢萘-1-酮.该方法具有反应条件温和、操作简单和产率较高等优点,并通过IR,1HNMR,元素分析确定了产物... 详细信息

以3,4-二氢-1-萘酮和查尔酮为原料,在K2CO3-NaOH存在下,无溶剂室温研磨反应,方便地得到2-[3-氧代-1,3-二(未)取代苯基丙基]-1,2,3,4-四氢萘-1-酮.该方法具有反应条件温和、操作简单和产率较高等优点,并通过IR,1HNMR,元素分析确定了产物的结构,3b晶体结构通过X衍射测定.

关键词： 1-四氢萘酮查尔酮无溶剂合成

Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期7卷 71-79页

作者： Ruo-Hang Xu Hao-Yu Jiang Dan-Dan Cui Kun-rong Du Hong-Run Zhang Sheng-Jie Xu Ya-Qi Li Zhi-Zhen Ren liang Wang Wei-Chang Hao Yi Du School of Physics and BUAA-UOW Joint Research centre Beihang University Shenzhen Institute of Beihang University centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词： Bi4NbO8Br/Bi2WO6 CO2 reduction Heterostructures Photocatalysts

PD-YOLO:Colon Polyp Detection Model Based on Enhanced Small-Target Feature Extraction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 913-928页

作者： Yicong Yu Kaixin Lin Jiajun Hong rong-Guei Tsai Yuanzhi Huang New Engineering Industry College Putian UniversityPutian351100China Engineering Research center of Big Data Application in Private Health Medicine(Putian University) Fujian Province UniversityPutian351100China Computer College Guangdong University of Science&TechnologyDongguan523668China

In recent years,the number of patientswith colon disease has increased *** polyps are the precursor lesions of colon *** not diagnosed in time,they can easily develop into colon cancer,posing a serious threat to patients’lives and health.A colonoscopy is an important means of detecting colon ***,in polyp imaging,due to the large differences and diverse types of polyps in size,shape,color,etc.,traditional detection methods face the problem of high false positive rates,which creates problems for doctors during the diagnosis *** order to improve the accuracy and efficiency of colon polyp detection,this question proposes a network model suitable for colon polyp detection(PD-YOLO).This method introduces the self-attention mechanism CBAM(Convolutional Block Attention Module)in the backbone layer based on YOLOv7,allowing themodel to adaptively focus on key information and ignore the unimportant *** help themodel do a better job of polyp localization and bounding box regression,add the SPD-Conv(Symmetric Positive Definite Convolution)module to the neck layer and use deconvolution instead of *** results indicate that the PD-YOLO algorithm demonstrates strong robustness in colon polyp *** to the original YOLOv7,on the Kvasir-SEG dataset,PD-YOLO has shown an increase of 5.44 percentage points in AP@0.5,showcasing significant advantages over other mainstream methods.

关键词： Polyp detection YOLOv7 SPD-Conv CBAM deconvolution

High-throughput screening of CO_(2) cycloaddition MOF catalyst with an explainable machine learning model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2025年第1期10卷 132-138页

作者： Xuefeng Bai Yi Li Yabo Xie Qiancheng Chen Xin Zhang Jian-rong Li Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemical Engineering College of Materials Science&EngineeringBeijing University of TechnologyBeijing100124China

The high porosity and tunable chemical functionality of metal-organic frameworks(MOFs)make it a promising catalyst design ***-throughput screening of catalytic performance is feasible since the large MOF structure database is *** this study,we report a machine learning model for high-throughput screening of MOF catalysts for the CO_(2) cycloaddition *** descriptors for model training were judiciously chosen according to the reaction mechanism,which leads to high accuracy up to 97%for the 75%quantile of the training set as the classification *** feature contribution was further evaluated with SHAP and PDP analysis to provide a certain physical understanding.12,415 hypothetical MOF structures and 100 reported MOFs were evaluated under 100℃ and 1 bar within one day using the model,and 239 potentially efficient catalysts were *** them,MOF-76(Y)achieved the top performance experimentally among reported MOFs,in good agreement with the prediction.

关键词： Metal-organic frameworks High-throughput screening Machine learning Explainable model CO_(2)cycloaddition

Enantioselective reductive conjugate alkenylation of α,β-enones with keto alkenyl acetates by nickel catalysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 157-162页

作者： rong-De He Yun-Lei Luo Qiu-Quan Pan Qi-Wei Yao Xing-Zhong Shu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University

Reactions involving alkenyl acetates offer cost-effective and environmentally friendly routes for alkene synthesis, yet their asymmetric variant remains elusive. Concurrently, asymmetric conjugate alkenylation predominantly centered on nucleophilic addition using alkenyl–M. This manuscript presents an asymmetric reductive conjugate alkenylation reaction involving alkenyl acetates. The method facilitates the enantioselective addition of keto alkenyl groups to α,β-enones, resulting in the formation of unsaturated diketones—a class of useful structural motifs that are challenging to access otherwise. The use of electron-rich Pyroxy ligand is essential for achieving both high reaction efficiency and enantioselectivity.

关键词： nickel alkenylation asymmetric cross-coupling alkenes