期刊文献+
共找到453篇文章
< 1 2 23 >
每页显示 20 50 100
Efficient electrooxidation of biomass-derived aldehydes over ultrathin Ni V-layered double hydroxides films 被引量:1
1
作者 Biying Liu Zhikeng Zheng +4 位作者 Yaoyu Liu Man Zhang Yuchen Wang Yangyang Wan Kai Yan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第3期412-421,I0012,共11页
Selective upgrading of C=O bonds to afford carboxylic acid is significant for the petrochemical industry and biomass utilization.Here we declared the efficient electrooxidation of biomass-derived aldehydes family over... Selective upgrading of C=O bonds to afford carboxylic acid is significant for the petrochemical industry and biomass utilization.Here we declared the efficient electrooxidation of biomass-derived aldehydes family over NiV-layered double hydroxides(LDHs) thin films.Mechanistic studies confirmed the hydroxyl active intermediate(-OH*) generated on the surface of NiV-LDHs films by employing electrochemical impedance spectroscopy and the electron paramagnetic resonance spectroscopy.By using advanced techniques,e.g.,extended X-ray absorption fine structure and high-angle annular dark-field scanning transmission electron microscopy,NiV-LDHs films with 2.6 nm could expose larger specific surface area.Taking benzaldehyde as a model,high current density of 200 mA cm^(-2)at 1.8 V vs.RHE,81.1% conversion,77.6% yield of benzoic acid and 90.8% Faradaic efficiency were reached,which was superior to most of previous studies.Theoretical DFT analysis was well matched with experimental findings and documented that NiV-LDHs had high adsorption capacity for the aldehydes to suppress the side reaction,and the aldehydes were oxidized by the electrophilic hydroxyl radicals formed on NiV-LDHs.Our findings offer a universal strategy for the robust upgrading of diverse biomass-derived platform chemicals. 展开更多
关键词 NiV-LDHs FILMS Hydroxyl radicals Electrocatalytic oxidation Biomass-derived aldehydes
下载PDF
Study on the catalytic degradation of sodium lignosulfonate to aromatic aldehydes over nano-CuO:Process optimization and reaction kinetics
2
作者 Yingjie Song Shuqi Zhong +5 位作者 Yingjiao Li Kun Dong Yong Luo Guangwen Chu Haikui Zou Baochang Sun 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第1期300-309,共10页
As one of the few renewable aromatic resources,the research of depolymerization of lignin into highvalue chemicals has attracted extensive attention in recent years.Catalytic wet aerobic oxidation(CWAO)is an effective... As one of the few renewable aromatic resources,the research of depolymerization of lignin into highvalue chemicals has attracted extensive attention in recent years.Catalytic wet aerobic oxidation(CWAO)is an effective technology to convert lignin like sodium lignosulfonate(SL),a lignin derivative,into aromatic aldehydes such as vanillin and syringaldehyde.However,how to improve the yield of aromatic aldehyde and conversion efficiency is still a challenge,and many operating conditions that significantly affect the yield of these aromatic compounds have rarely been investigated systematically.In this work,we adopted the stirred tank reactor(STR)for the CWAO process with nano-CuO as catalyst to achieve the conversion of SL into vanillin and syringaldehyde.The effect of operating conditions including reaction time,oxygen partial pressure,reaction temperature,SL concentration,rotational speed,catalyst amount,and NaOH concentration on the yield of single phenolic compound was systematically investigated.The results revealed that all these operating conditions exhibit a significant effect on the aromatic aldehyde yield.Therefore,they should be regulated in an optimal value to obtain high yield of these aldehydes.More importantly,the reaction kinetics of the lignin oxidation was explored.This work could provide basic data for the optimization and design of industrial operation of lignin oxidation. 展开更多
关键词 NANO-CUO Sodium lignosulfonate Catalytic wet aerobic oxidation(CWAO) Aromatic aldehyde Reaction kinetics
下载PDF
Environment friendly protocol for the synthesis of nitriles from aldehydes 被引量:8
3
作者 M.B.Madhusudana Reddy M.A.Pasha 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第9期1025-1028,共4页
A rapid and eco-friendly one-pot protocol for the synthesis of nitriles has been developed by treating various araldehydes bearing electron withdrawing as well as electron donating groups with hydroxylamine hydrochlor... A rapid and eco-friendly one-pot protocol for the synthesis of nitriles has been developed by treating various araldehydes bearing electron withdrawing as well as electron donating groups with hydroxylamine hydrochloride in the presence of non-toxic,non-corrosive and reusable zinc oxide(ZnO) as the catalyst under solvent-free microwave irradiation.The present approach offers the advantages of a clean reaction,simple methodology,employing readily available catalyst,short reaction duration(〈1 min),high selectivity;and high yield(90-98%). 展开更多
关键词 aldehydes NITRILES SOLVENT-FREE Microwave irradiation Benign procedure
下载PDF
β-Cyclodextrin promoted oxidation of aldehydes to carboxylic acids in water 被引量:7
4
作者 Dong Po Shi Hong Bing Ji 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第2期139-142,共4页
A facile, efficient and substrate-selective oxidation of aldehydes to carboxylic acids with NaClO catalyzed by β-cyclodextrin in water has been developed. A series of aldehydes which could form inclusion complex with... A facile, efficient and substrate-selective oxidation of aldehydes to carboxylic acids with NaClO catalyzed by β-cyclodextrin in water has been developed. A series of aldehydes which could form inclusion complex with β-cyclodextrin (β-CD) were oxidized selectively with excellent yields. 展开更多
关键词 Substrate-selective OXIDATION β-Cyclodextrin (β-CD) aldehydes
下载PDF
An Efficient and Green Procedure for the Preparation of gem-Dicar- boxylates from Aldehydes Catalyzed by Fe_2(SO_4)_3·xH_2O 被引量:6
5
作者 LingJunLI XinYingZHANG GuiShengZHANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第5期508-510,共3页
An efficient and environmentally benign conversion of aldehydes into the corresponding gem-dicarboxylates was realized by using hydrated ferric sulfate as a heterogeneous catalyst. In addition to its high efficiency,... An efficient and environmentally benign conversion of aldehydes into the corresponding gem-dicarboxylates was realized by using hydrated ferric sulfate as a heterogeneous catalyst. In addition to its high efficiency, the catalyst can be recovered simply and reused efficiently for at least seven times. 展开更多
关键词 gem-Dicarboxylates hydrated ferric sulfate protection of aldehydes green chemistry.
下载PDF
A Practical and Efficient Procedure for Preparation of Diacetals from 2,2-Bis(hydroxymethyl) propane-1,3-diol with Aldehydes and Ketones Catalysed by Anhydrous Ferrous Sulfate 被引量:6
6
《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 1999年第S1期285-285,共1页
关键词 A Practical and Efficient Procedure for Preparation of Diacetals from 2 2-Bis HYDROXYMETHYL propane-1 3-diol with aldehydes and Ketones Catalysed by Anhydrous Ferrous Sulfate
下载PDF
A simple and efficient method for solvent-free iodination of hydroxylated aromatic aldehydes and ketones using iodine and iodic acid by grinding method 被引量:3
7
作者 Archana Vibhute Shyam Mokle +2 位作者 Khushal Karamunge Vasant Gurav Yeshwant Vibhute 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第8期914-918,共5页
Green,mild and efficient iodination of hydroxylated aromatic aldehydes and ketones using iodine and iodic acid in the solidstate by grinding under solvent-free conditions at room temperature.This method provides sever... Green,mild and efficient iodination of hydroxylated aromatic aldehydes and ketones using iodine and iodic acid in the solidstate by grinding under solvent-free conditions at room temperature.This method provides several advantages such as environmentally friendly,short reaction times,high yields,non-hazardous and simple work-up procedure. 展开更多
关键词 IODINATION Aromatic aldehydes Aromatic ketones GRINDING
下载PDF
Aerobic oxidation of benzylic aldehydes to acids catalyzed by iron (Ⅲ) meso-tetraphenylporphyrin chloride under ambient conditions 被引量:2
8
作者 Xian Tai Zhou Hong Bing Ji Qiu Lan Yuan Jian Chang Xu Li Xia Pei Le Fu Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第8期926-928,共3页
Highly efficient aerobic oxidation of benzylic aldehydes to the corresponding acids catalyzed by iron (Ⅲ) meso-tetrapbenylporphyrin chloride (Fe(TPP)Cl) under ambient conditions was developed. The catalyst has ... Highly efficient aerobic oxidation of benzylic aldehydes to the corresponding acids catalyzed by iron (Ⅲ) meso-tetrapbenylporphyrin chloride (Fe(TPP)Cl) under ambient conditions was developed. The catalyst has been proved to be an excellent catalyst for the system in the presence of molecular oxygen and isobutryaldehyde at room temperature. 展开更多
关键词 Benzylic aldehydes Oxidation METALLOPORPHYRINS
下载PDF
Clean Aerobic Liquid Oxidation of Aldehydes with Solid Catalyst 被引量:2
9
作者 HongBingJI DuGuiHE +1 位作者 JunSONG YuQIAN 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第10期1241-1244,共4页
Clean liquid oxidation of aldehydes can be accomplished using solid catalyst in the presence of molecular oxygen at room temperature, which is a valuable alternative to traditional counterparts.
关键词 Clean oxidation aldehydes solid catalyst.
下载PDF
Oxone-Mediated Oxidative Esterification of Heterocyclic Aldehydes Using Indium(III) Triflate 被引量:3
10
作者 Tomoko Mineno Saki Yoshino Akira Ubukata 《Green and Sustainable Chemistry》 2014年第1期20-23,共4页
Recent investigations have shown the oxone-mediated oxidative methyl esterification of benzaldehyde derivatives using methanol. The reactions were accelerated in the presence of indium(III) triflate, a trivalent indiu... Recent investigations have shown the oxone-mediated oxidative methyl esterification of benzaldehyde derivatives using methanol. The reactions were accelerated in the presence of indium(III) triflate, a trivalent indium reagent, in many cases. Based on this method of methyl esterification of benzaldehyde derivatives, we further explored an application to heterocyclic aldehydes. The reactions were examined using methanol as well as other alcohols in order to establish a suitable range. 展开更多
关键词 Oxidative ESTERIFICATION HETEROCYCLIC aldehydes Indium(III) TRIFLATE
下载PDF
Selective oxidation of ethane to aldehydes over SBA-15 supported molybdenum catalyst 被引量:1
11
作者 Jianmei Li Jian Liu +7 位作者 Liwei Ren Qinglong Liu Zhen Zhao Yongsheng Chen Pengyu Zhu Yuechang Wei Aijun Duan Guiyuan Jiang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第5期609-616,共8页
SBA-15 supported Mo catalysts (Moy/SBA-15) were prepared by an ultrasonic assisted incipient-wetness impregnation method. The physical and chemical properties of the catalysts were characterized by means of N2-adsor... SBA-15 supported Mo catalysts (Moy/SBA-15) were prepared by an ultrasonic assisted incipient-wetness impregnation method. The physical and chemical properties of the catalysts were characterized by means of N2-adsorption-desorption, XRD, TEM, UV-Vis, Raman, XANES and H2-TPR. The results showed that a trace amount of MoO3 was produced on high Mo content samples. Tum-over frequency (TOF) and product selectivity are dependent on the molybdenum content. Both Mo0.75/SBA-15 and Mo1.75/SBA-15 catalysts give the higher catalytic activity and the selectivity to the total aldehydes for the selective oxidation of C2H6. At the reaction temperature of 625℃, the maximum yield of aldehydes reached 4.2% over Mo0.75/SBA-15 catalyst. The improvement of the activity and selectivity was related with the state of MoOx species. 展开更多
关键词 selective oxidation of ethane supported oxides catalysts Mo aldehydes SBA-15
下载PDF
THE SOLID STATE ALDOL CONDENSATION REACTION OF ACETYLFERROCENE AND AROMATIC ALDEHYDES 被引量:2
12
作者 Ji Ben MEIG Hong MA Yong Mei WANG Department of Chemistry,Nankai University,Tianjin,300071 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第6期475-478,共4页
The aldol condensation reactions of acetylferrocene with several aromatic aldehydes have been studied in the solid state.The results showed that they revealed different reactivities in the solid slate from that in sol... The aldol condensation reactions of acetylferrocene with several aromatic aldehydes have been studied in the solid state.The results showed that they revealed different reactivities in the solid slate from that in solution and eight compounds have been prepared. Their structures have been characterized by UV,IR,1~HNMR,HS and elemental analysis. 展开更多
关键词 OC THE SOLID STATE ALDOL CONDENSATION REACTION OF ACETYLFERROCENE AND AROMATIC aldehydes
下载PDF
Oxidation of benzyl alcohols to ketones and aldehydes by O3 process enhanced using high-gravity technology 被引量:1
13
作者 Wenqiang Gao Lei Du +1 位作者 Weizhou Jiao Youzhi Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第3期808-814,共7页
In this study,a practical process for ozonization of benzyl alcohols to ketones and aldehydes in a rotating packed bed(RPB-O3)reactor has been developed.Using 1-phenylethanol as a model reactant,the performance of RPB... In this study,a practical process for ozonization of benzyl alcohols to ketones and aldehydes in a rotating packed bed(RPB-O3)reactor has been developed.Using 1-phenylethanol as a model reactant,the performance of RPB-O3 process in different solvents has been compared with the commonly used stirred tank reactor(STR-O3).Ethyl acetate was the optimum solvent for the conversion of 1-phenylenthanol to acetophenone in RPB-O3 process,with 78%yield after 30 min.In a parallel STR-O3 experiment,the yield of acetophenone was50%.Other experimental variables,i.e.O3 concentration,reaction time,high-gravity factor and liquid flow rate were also optimized.The highest yield of acetophenone was obtained using O3 concentration of 80 mg·L-1,reaction time of 30 min,high gravity factor of 40 and liquid flow rate of 120 L·h-1.Under the optimized reaction conditions,a series of structurally diverse primary and secondary alcohols was oxidized with(19%–92%)yield.The ozonization mechanism was studied by Electron Paramagnetic Resonance(EPR)spectroscopy,monitoring the radical species formed upon self-decomposition of O3.The characteristic quadruple peak with the 1:2:2:1 intensity ratio that corresponds to hydroxyl radicals(·OH)was observed in the electron paramagnetic resonance(EPR)spectrum,indicating an indirect oxidation mechanism of alcohols via·OH radical. 展开更多
关键词 OZONE Benzyl alcohols aldehydes and ketones High-gravity technology
下载PDF
Condensation Reaction of α-Aroyl-α-acetyl Ketene Cyclic Dithioacetals with Aromatic Aldehydes 被引量:2
14
作者 Zhong Wei XIE Qun Xin FANG +3 位作者 Yu Lan HU Met Xin ZHAO Dong YU Qun LIU(Department of Chemistry, Northeast Normal University, Changchun, 130024) 《Chinese Chemical Letters》 SCIE CAS CSCD 1999年第1期5-6,共2页
The title compounds 3 and 4 condensed with aromatic aldehydes to give a--aroylsicinnamoyl ketene cyclic dithioacetals 5 and 6 with sodium ethoxide as the base. The stereochemistryofs and 6 was assigned as E-configurat... The title compounds 3 and 4 condensed with aromatic aldehydes to give a--aroylsicinnamoyl ketene cyclic dithioacetals 5 and 6 with sodium ethoxide as the base. The stereochemistryofs and 6 was assigned as E-configuration by 1H NMR. 展开更多
关键词 α-aroyl-α-cinnamoyl ketene cyclic dithioacetals aromatic aldehydes condensation reaction
下载PDF
Emissions of saturated C6-C10 aldehydes from poplar (Populus simonii×P. pyramidalis ‘Opera 8277’) cuttings at different levels of light intensity 被引量:1
15
作者 HU Zeng-hui LENG Ping-sheng +1 位作者 SHEN Ying-bai WANG Wen-he 《Journal of Forestry Research》 SCIE CAS CSCD 2011年第2期233-238,共6页
Aldehydes play an important role in atmospheric chemistry and plant direct and indirect defense against environmental stresses.In this study,the emissions of saturated C6-C10 aldehydes from Populus simonii × P.py... Aldehydes play an important role in atmospheric chemistry and plant direct and indirect defense against environmental stresses.In this study,the emissions of saturated C6-C10 aldehydes from Populus simonii × P.pyramidalis 'Opera 8277' cuttings were examined by using a gas chromatography/mass spectrometry(GC/MS) technique at three levels of light intensity(400,800 and 1 200 μmol·m-2·s-1).A positive correlation between the emissions of these aldehydes and light intensity was found.Moreover,nordi-hydroguaiaretic acid(NDGA),a special inhibitor of lipoxygenase(LOX),significantly inhibited the emissions of C6-C9 aldehydes at three levels of light intensity,but did not influence the emission of decanal(C10).The emissions of C6-C10 aldehydes in NDGA treated poplar cuttings,exhibited the same positive correlation with light intensity.The results indicated that LOX pathway contributes to the emissions of C6-C9 aldehydes,whereas some pathways regulated by light intensity might be a universal mechanism for emissions of C6-C10 aldehydes. 展开更多
关键词 C6-C10 aldehydes light intensity LIPOXYGENASE NDGA Populus simonii × P.pyramidalis 'Opera 8277'
下载PDF
Interactions Between Exogenous Bt Insecticidal Protein and Cotton Terpenoid Aldehydes 被引量:1
16
作者 ZHANG Yong-jun, GUO Yu-yuan, WU Kong-ming and WANG Wu-gang(Institute of Plant Protection , Chinese Academy of-Agricultural Sciences , Beijing 100094 , P. R . China) 《Agricultural Sciences in China》 CAS CSCD 2002年第6期642-647,共6页
The contents of terpenoid aldehydes in Bt transgenic cotton and their non-Bt parental varieties were analyzed by the HPLC method. Statistical analysis of variance showed that Bt insecticidal protein Bt-ICP expression ... The contents of terpenoid aldehydes in Bt transgenic cotton and their non-Bt parental varieties were analyzed by the HPLC method. Statistical analysis of variance showed that Bt insecticidal protein Bt-ICP expression has no negative effect on the synthesis of gossypol, total heliocides and total resistant terpenoids. The results of the combined dosage test of Bt-ICP and gossypol in vitro showed that there is no interaction between gossypol and Bt-ICP on the mortality of cotton bollworm larvae Helicoverpa armigera (Hubnner). It is indicated that the actions of Bt-ICP and gossypol on cotton bollworm are additive. Therefore, it is advantageous to combine Bt-ICP with cotton terpenoid aldehydes in controlling cotton bollworm. 展开更多
关键词 Bt-ICP Terpenoid aldehydes Interaction
下载PDF
STUDIES ON THE WITTIG REACTION(XIII): KINETICS OF THE PTC-WITTIG REACTIONS OF 2-BUTENYL METHYL-DIPHENYLPHOSPHONIUM SALT WITH SUBSTITUTED BEN2ALDEHYDES 被引量:1
17
作者 Wen Fang HUANG Ming Wu DING +1 位作者 Wen Jing XIAO Tian Jie WU Institute of Organic Sgnthesis, Central China Normal University, Wuhan 430O70 Center of Analysis and Testing, Central China Normal University, Wuhan 430070 《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第6期411-414,共4页
The kinetics of PTC-Wittig reaction between substituted aromatic aldehydes and 2-butenyl methyldiphenylphosphonium salt has been studied. The low reaction constant (ρ=0. 30) implies that these PTC-Wittig reactions ta... The kinetics of PTC-Wittig reaction between substituted aromatic aldehydes and 2-butenyl methyldiphenylphosphonium salt has been studied. The low reaction constant (ρ=0. 30) implies that these PTC-Wittig reactions take place through low polar intermediate. 展开更多
关键词 PTC XIII KINETICS OF THE PTC-WITTIG REACTIONS OF 2-BUTENYL METHYL-DIPHENYLPHOSPHONIUM SALT WITH SUBSTITUTED BEN2aldehydes STUDIES ON THE WITTIG REACTION
下载PDF
Dielectric Properties of Some Aldehydes 被引量:1
18
作者 I.M.El-Anwnr and I.Z.Selim (Physical Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt)A.A.Foad(Faculty of Science, Helwan University, Helwan, Cairo, Egypt) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第3期222-228,共7页
The apparent solution dipole moment, μ, the association factor S, and the correlation parameter g for some aldehydes are calculated at different temperatures. The results are discussed and compared with previous resu... The apparent solution dipole moment, μ, the association factor S, and the correlation parameter g for some aldehydes are calculated at different temperatures. The results are discussed and compared with previous results. The dielectric constant ε' and loss ε' for the investigated aldehydes were measured with different frequencies at 10-50℃. The variation of permittivities with both temperature and frequency is discussed. The relaxation times τ, for some aldehydes were calculated at different temperatures and its values were used in the calculation of the thermodynamic parameters △H and △S 展开更多
关键词 AM Dielectric Properties of Some aldehydes
下载PDF
THE REACTION OF AROMATIC ALDEHYDES WITH p-NITROBENZYLLIBUTYLTELLURONIUM BROMIDE BY PHASE TRANSFER CATALYSIS 被引量:1
19
作者 Qi ZHONG Jian Guo SHAO Chang Qing LIU Rong Jian LU Chemistry Department,Yangzhou Teachers College,Yangzhou,225002 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第4期275-276,共2页
Under the condition of solid-liquid phase transfer catalysis, olefins were obtained by the reaction of p-nitrobenzyldibutyltelluronium bromide with aromatic aldehyde.Under the condition of liquid-liquid phase transfer... Under the condition of solid-liquid phase transfer catalysis, olefins were obtained by the reaction of p-nitrobenzyldibutyltelluronium bromide with aromatic aldehyde.Under the condition of liquid-liquid phase transfer catalysis,however,different products were obtained due to the reactivity of different bases or aldehydes. 展开更多
关键词 CHC THE REACTION OF AROMATIC aldehydes WITH p-NITROBENZYLLIBUTYLTELLURONIUM BROMIDE BY PHASE TRANSFER CATALYSIS
下载PDF
New Greener Alternative for Biocondensation of Aldehydes and Indoles Using Lemon Juice: Formation of Bis-, Tris-, and Tetraindoles 被引量:1
20
作者 Rammohan Pal 《International Journal of Organic Chemistry》 2013年第2期136-142,共7页
This work presents a new greener alternative for biocondensation of aldehydes and indoles for the synthesis of bis- and tris(indolyl)methanes catalyzed by lemon juice (Citrus limon) in good yields under ultrasound irr... This work presents a new greener alternative for biocondensation of aldehydes and indoles for the synthesis of bis- and tris(indolyl)methanes catalyzed by lemon juice (Citrus limon) in good yields under ultrasound irradiation in aqueous ethanol. Various substituted aldehydes with indoles under this reaction condition are elucidated. Also, tetraindolyl compounds were prepared using terephthaldialdehyde by following the same protocol. This method is an environmentally benign, efficient reaction, which requires shorter reaction time and simple experimental and work-up procedures. 展开更多
关键词 Citrus limon JUICE Biocondensation aldehydes INDOLES Aqueous Ethanol Sonication Bis- Tris- Tetraindoles
下载PDF
上一页 1 2 23 下一页 到第
使用帮助 返回顶部