检索结果-南通市图书馆

Palladium (0) Nanoparticles: A Novel and Reusable Catalyst for the Synthesis of Various pyran Derivatives

Advances in Nanoparticles 2012年第3期1卷 61-70页

作者： Mithu Saha Amarta Kumar Pal North Eastern Hill University Department of Chemistry Mawlai Campus Shillong India

A ligand free, Palladium nanoparticles catalyzed synthesis of pyran derivatives using C-H activated compound, malononitrile and aryl aldehyde via Knoevenagel condensation followed by Michael addition reaction using Palladium nanoparticles as catalyst in one-pot is described herein. The advantages of this method lie in its simplicity, low catalyst loading, cost effectiveness and easy to handle. The Palladium Nanoparticles can be reused without loss of activity even after recycling four times. The palladium nanoparticles were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM). The present method also allows us to synthesize highly functionalized title compounds from simple and readily available inputs.

关键词： Palladium Nanoparticles Multi-Component Reaction pyran Derivatives Dimedone 4-Hydroxy Coumarin pyranazolone

来源：

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

A General Synthetic Route to Functionalized 6-Phenyl-6H-Dibenzo[b,d] pyran Derivatives from 3-Nitro-2H-Chromenes

A General Synthetic Route to Functionalized 6-Phenyl-6H-Dibe...

引用

中国化学会第27届学术年会

作者： Ping-Li, Ling-Ling Luo, Zheng Wang, Dong-Cheng Xu, Xin-Sheng Li, Jian-Wu Xie* Department of Chemistry and Life Science, Zhejiang Normal University, Jinhua, 321004

＜正＞Amone of this class of benzopyrans, the dibenzo[b,d]pyran nucleus constitutes the skeleton of a number of physiologically active natural products as well as drugs, such as cannabinol, a

关键词： Chromenes pyran α α-dicyanoolefins tandem reaction

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Electronic Transport Properties of a Naphthopyran-Based Optical Molecular Switch: an ab initio Study

引用

Chinese Physics Letters 2011年第9期28卷 104-107页

作者： XIA Cai-Juan LIU De-Sheng ZHANG Ying-Tang School of Science Xian Polytechnic UniversityXi'an 710048 School of Physics Shandong UniversityJinan 250100 Department of Physics Jining UniversityQufu 273155

The electronic transport properties of a naphthopyran-based molecular optical switch are investigated by using the nonequilibrium Green's function formalism combined with first-principles density functional *** molecule that comprises the switch can convert between its open and closed forms upon *** results show that the current through the open form is significantly larger than that through the closed form,which is different from other optical switches based on ring-opening reactions of the molecular *** maximum on-off ratio(about 90)can be obtained at 1.4 *** physical origin of the switching behavior is interpreted based on the spatial distributions of molecular orbitals and the HOMO-LUMO *** result shows that the naphthopyran-based molecule is a good candidate for optical molecular switches and will be useful in the near future.

关键词： theory pyran nonequilibrium

来源：

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

Highly efficient one-pot synthesis of dihydropyran heterocycles

引用

Chinese Chemical Letters 2014年第2期25卷 212-214页

作者： Mohamed A.Ameen Sara M.Motamed Fathy F.Abdel-latif Chemistry Department.Faculty of Science El Minia University

Diammonium hydrogen phosphate and potassium carbonate-catalyzed one-pot synthesis of 1,4- phenylene-bis（2-amino-4H-pyran-3-carbonitrile and 2-amino-4-aryl-4H-pyran-3-carbonitrile deriva- tives has been achieved by a three-component cyclocondensation of aldehydes, malononitrile, and different nucleophiles in aqueous medium in high yields.

关键词： One pot synthesis Diammonium hydrogen phosphate pyran Aqueous media

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multimodal 4-arylchromene derivatives with microtubule-destabilizing,anti-angiogenic,and MYB-inhibitory activities

引用

Cancer Drug Resistance 2023年第1期6卷 59-77页

作者： Leonhard H.F.Kohler Sebastian Reich Maria Yusenko Karl-Heinz Klempnauer Gerrit Begemann Rainer Schobert Bernhard Biersack Organic Chemistry Laboratory University of BayreuthBayreuth 95440Germany Institute for Biochemistry Westfalische-Wilhelms-UniversitatMunster 48149Germany Developmental Biology University of BayreuthBayreuth 95440Germany

Aim:Efficient and readily available anticancer drugs are sought as treatment *** this reason,chromene derivatives were prepared using the one-pot reaction and tested for their anticancer and anti-angiogenic ***:2-Amino-3-cyano-4-(aryl)-7-methoxy-4H-chromene compounds(2A-R)were repurposed or newly synthesized via a three-component reaction of 3-methoxyphenol,various aryl aldehydes,and *** performed assays to study the inhibition of tumor cell growth[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromid(MTT)assay],effects on microtubules(immunofluorescence),cell cycle(flow-activated cell sorting analysis),angiogenesis(zebrafish model),and MYB activity(luciferase reporter assay).Fluorescence microscopy was applied for localization studies via copper-catalyzed azide-alkyne click reaction of an alkyne-tagged drug ***:Compounds 2A-C and 2F exhibited robust antiproliferative activities against several human cancer cell lines(50%inhibitory concentrations in the low nanomolar range)and showed potent MYB *** alkyne derivative 3 was localized in the cytoplasm after only 10 min of *** microtubule disruption and G2/M cell-cycle arrest were observed,where compound 2F stood out as a promising microtubule-disrupting *** study of anti-angiogenic properties showed that 2A was the only candidate with a high potential to inhibit blood vessel formation in ***:The close interplay of various mechanisms,including cell-cycle arrest,MYB inhibition,and anti-angiogenic activity,led to identifying promising multimodal anticancer drug candidates.

关键词： Chromene pyran anticancer drugs microtubule angiogenesis MYB inhibition

来源：

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

具有聚集诱导发光行为的环状多烯类分子(英文)

引用

发光学报 2006年第3期27卷 281-284,i0001页

作者：童辉董永强 Huβler Matthias 唐本忠香港科技大学化学系

研究了4H-pyrans,fulvenes,siloles等环状多烯结构的小分子荧光染料在溶液,固态及薄层层析板上的荧光发射行为。与大多数传统的荧光染料小分子不同,这些多烯类荧光染料分子在稀溶液中基本没有荧光,而在聚集态下呈现非常明亮的荧光发射,... 详细信息

研究了4H-pyrans,fulvenes,siloles等环状多烯结构的小分子荧光染料在溶液,固态及薄层层析板上的荧光发射行为。与大多数传统的荧光染料小分子不同,这些多烯类荧光染料分子在稀溶液中基本没有荧光,而在聚集态下呈现非常明亮的荧光发射,同时伴随着荧光量子效率的大幅提高(聚集诱导发光)。它们在薄层层析板上也具有很强的荧光发射。但当薄层层析板暴露于有机溶剂气氛下,荧光消失,离开有机溶剂气氛,荧光恢复,这一可逆过程并可多次重复。在固体状态,它们的荧光发射与聚集态结构密切相关。通过从无定型态到结晶态以及从一种结晶态到另一种结晶态的变化,可以有效的调节它们的固体荧光发射。

关键词：光致发光聚集诱导发光 silole fulvene pyran

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

浅析非掺杂超薄层DCJTB的位置对有机电致发光器件性能的影响

引用

门窗 2015年第10期 69-70页

作者：王冬梅长春职业技术学院

1前言在OLEDs显示的市场上,人们普遍把红色荧光染料4-（dicyanomethylene）-2-t-butyl-6（1,1,7,7-tetramethyljulolidyl-9-enyl）-4H-pyran（DCJTB）作为客体掺杂材料,尽管DCJTB是很好的红色荧光染料,它的发光波长为620nm,并且量子效... 详细信息

关键词： DCJTB 超薄层发光波长荧光染料量子效率言在 pyran 发光层最大亮度直接复合

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：