期刊文献+
共找到24篇文章
< 1 2 >
每页显示 20 50 100
可循环利用的固体氧化剂两相氧化偶联合成2-氨基-2'-羟基-1,1'-联萘的研究 被引量:1
1
作者 蒋毅 王娟芸 +6 位作者 陈君和 王伟军 闫寒 张小霞 王超 张国林 李伯刚 《化学学报》 SCIE CAS CSCD 北大核心 2007年第17期1925-1928,共4页
采用浸渍法制备了不同负载量的FeCl3/Al2O3固体氧化剂,并考察了载体和溶剂对氧化2-萘胺和2-萘酚交叉偶联的影响.结果表明:在60℃,氯苯作溶剂的情况下,含TiO2(质量分数)5%的载体,负载10%FeCl3时2-氨基-2'-羟基-1,1'-联萘(NOBIN)... 采用浸渍法制备了不同负载量的FeCl3/Al2O3固体氧化剂,并考察了载体和溶剂对氧化2-萘胺和2-萘酚交叉偶联的影响.结果表明:在60℃,氯苯作溶剂的情况下,含TiO2(质量分数)5%的载体,负载10%FeCl3时2-氨基-2'-羟基-1,1'-联萘(NOBIN)的收率最高达到了95.01%;用过的固体氧化剂经H2O2氧化处理后活性明显恢复,证明此法是一条循环再生的有效途径. 展开更多
关键词 2-萘胺 2-萘酚 固体氧化剂 交叉偶联 2-氨基-2'-羟基-1 1'-联萘
下载PDF
药物中间体2-(2'-羟基-4'-氨基苯基)苯并噻唑的合成工艺改进 被引量:1
2
作者 陈卓 陈研明 《中国药业》 CAS 2013年第10期35-36,共2页
目的改进2-(2'-羟基-4'-氨基苯基)苯并噻唑的合成工艺。方法以邻氨基苯硫酚与对氨基水杨酸为原料,对该反应的合成方法进行改进。结果将反应收率由50%提高至81.7%,反应温度由150℃降至50℃,反应时间由3 h缩短至45 min。结论改进... 目的改进2-(2'-羟基-4'-氨基苯基)苯并噻唑的合成工艺。方法以邻氨基苯硫酚与对氨基水杨酸为原料,对该反应的合成方法进行改进。结果将反应收率由50%提高至81.7%,反应温度由150℃降至50℃,反应时间由3 h缩短至45 min。结论改进工艺既降低了成本,又增加了反应的环境友好性。 展开更多
关键词 2-(2'-羟基-4'-氨基苯基)苯并噻唑 三甲基氯硅烷 合成工艺
下载PDF
2-(2'-羟基苯基)苯并噻唑的合成及荧光性能研究 被引量:2
3
作者 陈明强 《中国矿业大学学报》 EI CAS CSCD 北大核心 2002年第3期319-322,共4页
分别以水杨酸和 3-羟基 -2 -萘甲酸为原料 ,经过与邻氨基硫酚的缩合闭环反应 ,合成了 2 -( 2 ' -羟基苯基 ) -苯并噻唑和 2 -( 3' -羟基萘 -2 ' -基 )苯并噻唑 ,通过质谱、核磁共振、红外、元素分析表征了它们的结构 .采用... 分别以水杨酸和 3-羟基 -2 -萘甲酸为原料 ,经过与邻氨基硫酚的缩合闭环反应 ,合成了 2 -( 2 ' -羟基苯基 ) -苯并噻唑和 2 -( 3' -羟基萘 -2 ' -基 )苯并噻唑 ,通过质谱、核磁共振、红外、元素分析表征了它们的结构 .采用 X-衍射方法测定了 2 -( 2 ' -羟基苯基 ) -苯并噻唑的两种晶体结构 ,讨论了荧光与其晶体晶型的关系 .结果表明 :这两个化合物属于分子内质子转移化合物 ,在紫外光的激发下 ,2 -( 2 ' -羟基苯基 ) -苯并噻唑在固态时能发出强烈的黄绿色荧光 ,而 2 -( 3' -羟基萘 -2 ' -基 ) 展开更多
关键词 2-(2'-羟基苯基)苯并噻唑 合成 荧光性能
下载PDF
铜胺络合物催化合成取代2-氨基-2'-羟基-1,1'-联萘类化合物
4
作者 陈之朋 刘叔文 《中山大学学报(自然科学版)》 CAS CSCD 北大核心 2015年第4期79-83,共5页
采用Cu Cl2·2H2O和苄胺(摩尔比为1∶4)的络合物作为氧化偶合试剂,甲醇作溶剂,室温下以取代2-萘酚与2-萘胺为原料进行氧化偶合反应,以中等产率得到一批结构新颖的含取代基的NOBIN类似物,目标产物以沉淀析出,反应后处理简单。产物结... 采用Cu Cl2·2H2O和苄胺(摩尔比为1∶4)的络合物作为氧化偶合试剂,甲醇作溶剂,室温下以取代2-萘酚与2-萘胺为原料进行氧化偶合反应,以中等产率得到一批结构新颖的含取代基的NOBIN类似物,目标产物以沉淀析出,反应后处理简单。产物结构经核磁、质谱确证。 展开更多
关键词 铜胺络合物 氧化偶合反应 2-氨基-2'-羟基-1 1'-联萘 合成
下载PDF
2-羟基-3-氯丙基-2'-氯乙基醚的合成
5
作者 刘鹏 刁根秀 任华 《氯碱工业》 CAS 2015年第1期26-27,共2页
采用三氟化硼乙醚络合物为催化剂,2-氯乙醇和环氧氯丙烷为原料合成了2-羟基-3-氯丙基-2'-氯乙基醚。确定了适宜的反应条件:2-氯乙醇和环氧氯丙烷摩尔比为2.5∶1、反应温度65℃,反应时间为4 h,催化剂用量为环氧氯丙烷质量的1.1%。在... 采用三氟化硼乙醚络合物为催化剂,2-氯乙醇和环氧氯丙烷为原料合成了2-羟基-3-氯丙基-2'-氯乙基醚。确定了适宜的反应条件:2-氯乙醇和环氧氯丙烷摩尔比为2.5∶1、反应温度65℃,反应时间为4 h,催化剂用量为环氧氯丙烷质量的1.1%。在此条件下,产品收率为80%。 展开更多
关键词 2-羟基-3-氯丙基-2'-氯乙基醚 合成 反应条件 2-氯乙醇 环氧氯丙烷 三氟化硼乙醚络合物
下载PDF
溶剂调控2-(2'-羟基-5'-硝基)苯基苯并咪唑的基态结构
6
作者 岳倩倩 赵彦英 《物理化学进展》 2022年第2期69-77,共9页
通过2-(2&#39;-羟基-5&#39;-硝基)苯基苯并咪唑(HBI-pNO2)在苯、四氢呋喃、乙腈及甲醇中的稳态吸收光谱,结合密度泛函理论及含时密度泛函理论计算确定了,非极性溶剂中,HBI-pNO2以顺式醇构型存在于基态。借助HBI-pNO2在碱性环境... 通过2-(2&#39;-羟基-5&#39;-硝基)苯基苯并咪唑(HBI-pNO2)在苯、四氢呋喃、乙腈及甲醇中的稳态吸收光谱,结合密度泛函理论及含时密度泛函理论计算确定了,非极性溶剂中,HBI-pNO2以顺式醇构型存在于基态。借助HBI-pNO2在碱性环境中的稳态吸收光谱确定了,在极性溶剂甲醇中,HBI-pNO2在长波长处的吸收带对应于阴离子的吸收。实验结合理论计算指认了其阴离子结构。 展开更多
关键词 2-(2'-羟基-5'-硝基)苯基苯并咪唑 溶剂极性 阴离子 扭转分子内电荷转移(TICT)
下载PDF
基于2-(2'-羟基苯)噁唑啉锌的双核及四核配合物的设计合成、晶体结构及荧光性质
7
作者 张宇翱 张静 《中国科学院大学学报(中英文)》 CAS CSCD 北大核心 2015年第3期404-408,共5页
利用2-(2'-羟基苯)噁唑啉作为配体,通过与不同的锌盐进行反应,得到结构新颖的双核及四核配合物.对该系列化合物用元素分析,红外光谱进行表征.X-射线衍射单晶结构分析发现在配合物1中2-(2'-羟基苯)噁唑啉配体的羟基氧作为单原子... 利用2-(2'-羟基苯)噁唑啉作为配体,通过与不同的锌盐进行反应,得到结构新颖的双核及四核配合物.对该系列化合物用元素分析,红外光谱进行表征.X-射线衍射单晶结构分析发现在配合物1中2-(2'-羟基苯)噁唑啉配体的羟基氧作为单原子桥连接2个锌离子,配合物2中除配体的羟基氧桥之外还存在甲氧基的氧原子桥连3个锌离子.配合物1属于单斜晶系,空间群为P21,晶胞参数:a=9.384 2(19),b=13.584 0(30),c=11.138 0(20),β=96.250°(30).配合物2属于三斜晶系,空间群为P-1,晶胞参数为a=9.551 7(19),b=11.123 4(22),c=11.182 6(22),α=102.820°(30),β=114.988°(30),γ=100.806°(30).对配合物1的甲醇溶液中及固相荧光光谱进行研究,结果显示它有较好的荧光性质. 展开更多
关键词 2-(2'-羟基苯)噁唑啉 双核金属配合物 四核金属配合物 晶体结构
下载PDF
2-(2′-羟基苯基)吡啶并噻唑类化合物的合成、结构及光谱性质研究 被引量:1
8
作者 覃彪 陈勇 +1 位作者 吕小军 傅文甫 《影像科学与光化学》 CAS CSCD 北大核心 2014年第2期171-180,共10页
分别使用水杨醛和2-羟基-1-萘甲醛与2-巯基-3-氨基吡啶反应得到了希夫碱配体L1、L2,在三乙胺和三氟化硼乙醚的反应条件下得到了2-(2′-羟基苯基)吡啶并噻唑配体L3和氟硼化合物B1、B2,通过X-射线单晶衍射分析确定了L3和B1的晶体结构。2-(... 分别使用水杨醛和2-羟基-1-萘甲醛与2-巯基-3-氨基吡啶反应得到了希夫碱配体L1、L2,在三乙胺和三氟化硼乙醚的反应条件下得到了2-(2′-羟基苯基)吡啶并噻唑配体L3和氟硼化合物B1、B2,通过X-射线单晶衍射分析确定了L3和B1的晶体结构。2-(2′-羟基苯基)吡啶并噻唑类化合物(简称HPT)是一类具有激发态质子转移(ESIPT)效应的有机分子,本文通过紫外可见吸收光谱和稳态荧光光谱研究了溶剂极性对ESIPT效应的影响。 展开更多
关键词 2-(2'-羟基苯基)吡啶并噻唑 激发态质子转移 晶体结构 光谱性质
下载PDF
纺织品中的2-(2’羟基-3’,5’-二叔丁基苯基)-苯并三唑含量的气相色谱测定 被引量:14
9
作者 薛建平 朱峰 涂貌贞 《质量技术监督研究》 2012年第4期18-20,48,共4页
通过对萃取方式和色谱条件的优化,建立了纺织品中的2-(2'-羟基-3',5'-二叔丁基苯基)-苯并三唑的气相色谱-氢离子火焰检测器的测定方法。结果表明该方法的回收率在90%~110%,相对标准偏差小于10%,方法检测限可达0.3mg/kg。... 通过对萃取方式和色谱条件的优化,建立了纺织品中的2-(2'-羟基-3',5'-二叔丁基苯基)-苯并三唑的气相色谱-氢离子火焰检测器的测定方法。结果表明该方法的回收率在90%~110%,相对标准偏差小于10%,方法检测限可达0.3mg/kg。本方法操作简单、快速,准确度和灵敏度高,重现性好,适用于纺织品中2-(2'-羟基-3',5'-二叔丁基苯基)-苯并三唑含量的日常检测。 展开更多
关键词 2-(2'-羟基-3' 5'-二叔丁基苯基)-苯并三唑 纺织品 气相色谱 测定
下载PDF
Flotation behavior and adsorption mechanism of(1-hydroxy-2-methyl-2-octenyl) phosphonic acid to cassiterite 被引量:15
10
作者 谭鑫 何发钰 +1 位作者 尚衍波 印万忠 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2469-2478,共10页
The flotation behavior and adsorption mechanism of novel(1-hydroxy-2-methyl-2-octenyl) phosphonic acid(HEPA) to cassiterite were investigated by micro-flotation tests, zeta potential measurements, FTIR determinati... The flotation behavior and adsorption mechanism of novel(1-hydroxy-2-methyl-2-octenyl) phosphonic acid(HEPA) to cassiterite were investigated by micro-flotation tests, zeta potential measurements, FTIR determination and density functional theory(DFT) calculation. The flotation results demonstrated that HEPA exhibited superior collecting performance compared with styrene phosphonic acid(SPA). The cassiterite recovery maintained above 90% over a wide pH range of 2-9 with 50 mg/L HEPA. The results of zeta potential measurement and FTIR detection indicated that the adsorption of HEPA onto cassiterite was mainly attributed to the chemisorption between HEPA monoanions and Sn species on mineral surfaces. The DFT calculation results demonstrated that HEPA monoanions owned higher HOMO energy and exhibited a better affinity to cassiterite than SPA, which provided very clear evidence for the stronger collecting power of HEPA presented in floatation test and zeta potential measurement. 展开更多
关键词 (1-hydroxy-2-methyl-2-octenyl) phosphonic acid CASSITERITE adsorption FLOTATION density functional theory
下载PDF
Metabolites of Marine-derived Mangrove Endophytic Fungus #2492 from the South China Sea
11
作者 朱峰 林永成 +2 位作者 王军 周世宁 Vrijmoed L L P 《Marine Science Bulletin》 CAS 2006年第2期92-96,共5页
Two metabolites (A and B) were isolated from the mycelium of mangrove endophytic fungus Stysanus like sp. (#2492) from the South China Sea. Their structures were identified by spectral data as N-(2-hydroxytetraco... Two metabolites (A and B) were isolated from the mycelium of mangrove endophytic fungus Stysanus like sp. (#2492) from the South China Sea. Their structures were identified by spectral data as N-(2-hydroxytetracosyl)-2-amino-1,3,4-trihydroxyoctadecane (A) and γ -stearolactone (B). It is the first report that γ -stearolactone (B) is isolated from marine fungus as natural product. 展开更多
关键词 marine fungus METABOLITES N-2-hydroxytetracosyl)-2-amino-1 3 4-tfihydroxy -octadecane γ -stearolactone
下载PDF
Synthesis and Crystal Structure of 3-(2-Hydroxy-phenyl)-5-(2-methyl-phenyl)-6-thoxycarbonyl-cyclohexen-2-one
12
作者 刘胜利 戴静芳 +1 位作者 陈勇 刘汉文 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2005年第3期324-328,共5页
Hydroxy-phenyl)-5-(2-methyl-phenyl)-6-ethoxycarbonyl-cyclohexen-2-one has been synthesized and characterized by elemental analysis, IR, UV, H NMR and MS, and its crystal 1 structure was determined by X-ray single-crys... Hydroxy-phenyl)-5-(2-methyl-phenyl)-6-ethoxycarbonyl-cyclohexen-2-one has been synthesized and characterized by elemental analysis, IR, UV, H NMR and MS, and its crystal 1 structure was determined by X-ray single-crystal diffraction method. The crystal belongs to the monoclinic system, space group P21/c with a = 14.6298(13), b = 5.8623(5), c = 22.255(2) ?, β = 105.855(2)o, V = 1836.0(3) ?3, Mr = 350.40, Z = 4, Dc = 1.268 g/cm3, F(000) = 744, μ(MoKα) = 0.086 mm-1, R = 0.0680 and wR = 0.1498. The crystal analysis results show that the cyclohexene unit of the title compound has a quasi-chair conformation, and a centrosymmetric dimer with a 16-membered ring is produced by the intermolecular hydrogen bonds. 展开更多
关键词 hydroxy-phenyl)-5-phenyl-6-ethoxycarbonyl-cyclohex-2-enone crystal structure hydrogen bond synthesis UV spectrum
下载PDF
Synthesis and Crystal Structure of an Ion- pair Compound: [HL]_2[Ni(CN)_4]·4H_2O (L = 4-(2- Hydroxyphenyl)-1,5, 9-triazacyclododecan-2-one) 被引量:1
13
作者 李建荣 谢亚勃 +3 位作者 蔡丽珍 郭国聪 卜显和 黄锦顺 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2004年第4期361-365,共5页
An ion-pair compound, [HL]2[Ni(CN)4]4H2O 1 has been obtained as an unexpected product when we attempt to prepare a heterometallic cyano-bridged complex by the reaction of GdCl3nH2O, K2Ni(CN)4 and L (L=4-(2-hydroxyphen... An ion-pair compound, [HL]2[Ni(CN)4]4H2O 1 has been obtained as an unexpected product when we attempt to prepare a heterometallic cyano-bridged complex by the reaction of GdCl3nH2O, K2Ni(CN)4 and L (L=4-(2-hydroxyphenyl)-1,5,9-triazacyclododecan-2-one) in aqueous solution, and characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.380(1), b = 9.9637(8), c = 17.087(1) ? ?= 105.947(2)? V = 2026.6(3) ?, Rint = 0.0509, Z = 2, Dc = 1.297 g/cm3, C34H56O8N10Ni, Mr = 791.60, F(000) = 844, m(MoKa) = 0.538 mm1, S = 1.030, the final R = 0.0644 and wR = 0.1299 for 2023 observed reflections with I ≥ 2(I). The title compound 1 contains one anion of [Ni(CN)4]2, two cations of [HL]+ and four packing water molecules, which are held together by the NH···O and OH···O hydrogen bonds to form a three- dimensional framework. 展开更多
关键词 tetracyanonickelate anion macrocyclic triamine cation crystal structure
下载PDF
选择性合成手性八氢NOBIN和四氢NOBIN 被引量:1
14
作者 李新生 孟祥燕 徐东成 《有机化学》 SCIE CAS CSCD 北大核心 2008年第10期1816-1819,共4页
通过部分氢化手性的(S)-NOBIN[(S)-2-氨基-2'-羟基-1,1'-联萘]选择性地合成了(S)-H8-NOBIN和(S)-H'4-NOBIN.弱极性溶剂(环己烷)和强极性溶剂(2,2,2-三氟乙醇和含乙酸的乙醇)几乎专一地得到(S)-H8-NOBIN(92%).而中等极性溶剂... 通过部分氢化手性的(S)-NOBIN[(S)-2-氨基-2'-羟基-1,1'-联萘]选择性地合成了(S)-H8-NOBIN和(S)-H'4-NOBIN.弱极性溶剂(环己烷)和强极性溶剂(2,2,2-三氟乙醇和含乙酸的乙醇)几乎专一地得到(S)-H8-NOBIN(92%).而中等极性溶剂(甲醇,乙醇和异丙醇)以中等产率得到(S)-H'4-NOBIN(66%). 展开更多
关键词 氢化 催化剂 手性 2-氨基-2'-羟基-1 1'-联萘 5' 6' 7' 8'-四氢-2-氨基-2'-羟基-1 1'-联萘
下载PDF
高效液相色谱法测定沉香药材中两种活性成分的含量 被引量:17
15
作者 陈亚 江滨 曾元儿 《时珍国医国药》 CAS CSCD 北大核心 2007年第7期1697-1698,共2页
目的建立高效液相色谱法测定沉香药材中6-羟基-2-[2-(4'-甲氧基苯乙基)]色酮(A),6-羟基-2-(2-苯乙基)色酮(B)2种活性成分的含量。方法采用HPLC法,色谱柱为D iamonsilTMRP-18色谱柱(250 mm×4.6 mm,5μm);流动相为乙腈-甲醇-水(2... 目的建立高效液相色谱法测定沉香药材中6-羟基-2-[2-(4'-甲氧基苯乙基)]色酮(A),6-羟基-2-(2-苯乙基)色酮(B)2种活性成分的含量。方法采用HPLC法,色谱柱为D iamonsilTMRP-18色谱柱(250 mm×4.6 mm,5μm);流动相为乙腈-甲醇-水(27∶27∶46),流速0.8 ml.min-1;柱温35℃;检测波长226 nm。结果6-羟基-2-[2-(4'-甲氧基苯乙基)]色酮(A)在0.070 8~0.354 mg范围内与峰面积呈良好的线性关系,平均回收率为97.75%,RSD为1.14%;6-羟基-2-(2-苯乙基)色酮(B)在0.232 mg^16 mg范围内与峰面积呈良好的线性关系,平均回收率为98.40%,RSD为1.29%。结论该方法简便、准确,可用于沉香药材中6-羟基-2-[2-(4'-甲氧基苯乙基)]色酮(A)和6-羟基-2-(2-苯乙基)色酮(B)的含量测定。 展开更多
关键词 沉香6-羟基-2-[2-(4'-甲氧基苯乙基)]色酮 6-羟基-2-(2-苯乙基)色酮 高效液相色谱法
下载PDF
Chemical Constituents of Rheum tanguticum Maxim.ex Balf. 被引量:2
16
作者 金伟 格日立 +3 位作者 黄志勤 魏全嘉 包天佑 屠鹏飞 《Journal of Chinese Pharmaceutical Sciences》 CAS 2006年第4期206-210,共5页
Aim To study the chemical constituents of the root and rhizome of Rheum tanguticum Maxim. ex Balf. Methods Chemical constituents were isolated and purified by many chromatographic methods, and their structures were el... Aim To study the chemical constituents of the root and rhizome of Rheum tanguticum Maxim. ex Balf. Methods Chemical constituents were isolated and purified by many chromatographic methods, and their structures were elucidated by MS, NMR, and others. Results Twenty compounds were isolated and their structures were identified as β-sitosterol, chrysophanol, aloe-emodin, physcion, rhein, emodin, etc. Conclusion Among these compounds, 4-(4′-hydroxyphenyl)-2-butanone, 4-(4′-hydroxyphenyl)-2-butanone-4′-O-β-D-(2″-... 展开更多
关键词 Rheum tanguticum Maxim ex Balf. 4-(4′-hydroxyphenyl)-2-butanone 4-(4′-hydroxyphenyl)-2-butanone-4′-O-β-D-2-O-cinnamoyl-6″-O-galloyl)-glucopyranoside 4-(4′-hydroxyphenyl)-2-butanone-4′-O-β-D-2-O-galloyl-6″-O-p-coumaroyl)-glucopyranoside.
下载PDF
Preparation and Purification of Halogenated Hydroxydiphenyl Ethers 被引量:1
17
作者 宋健 冯荣秀 +3 位作者 陈磊 王军波 石巍 王琨 《Transactions of Tianjin University》 EI CAS 2002年第1期37-39,共3页
As a good antimicrobial active ingredient, 2,4,4′ trichloro 2′ hydroxydiphenyl ether has been already commercially available since 1970s. For this paper halogenated hydroxydiphenyl ethers were prepared and purifi... As a good antimicrobial active ingredient, 2,4,4′ trichloro 2′ hydroxydiphenyl ether has been already commercially available since 1970s. For this paper halogenated hydroxydiphenyl ethers were prepared and purified, and their analytical conditions by HPLC were studied. Further purification of 2,4,4′ trichloro 2′ hydroxydiphenyl ether was also studied. The adsorption ability of different decolourants, e.g. alumina and bentonite, for each component in crude product of 2,4,4′ trichloro 2′ hydroxydiphenyl ether was varied. 2,4,4′ trichloro 2′ hydroxydiphenyl ether might be adsorbed by active carbon. The colored impurities might be adsorbed by alumina. The colorless impurities might be adsorbed by bentonite. 展开更多
关键词 trichloro 2 hydroxydiphenyl ether 2 6 4′ trichloro 2 hydroxydiphenyl ether 4 4′ dichloro 2 hydroxydiphenyl ether PURIFICATION
全文增补中
Hydrophobic intensification flotation:Comparison of collector containing two minerophilic groups with conventional collectors 被引量:14
18
作者 Sheng LIU Guang-yi LIU +1 位作者 Yao-guo HUANG Hong ZHONG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第9期2536-2546,共11页
The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and mic... The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and micro-flotation experiments.The results showed that S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester(HAOODE)exhibited stronger hydrophobization and better flotation performance to malachite(Cu2(OH)2CO3)than octyl-hydroxamic acid(OHA)and its combination with S-allyl-O-ethyl xanthate ester(AEXE).To understand the hydrophobic intensification mechanism of HAOODE to malachite,zeta potential,atomic force microscopy(AFM)and XPS measurements were carried out.The results recommended that malachite chemisorbed HAOODE to form Cu—HAOODE complexes in which the hydroxamate—(O,O)—Cu and—O—C(—S—Cu)—S—configurations co-existed.The co-adsorption of HAOODE’s hetero-difunctional groups was more stable than the single-functionalgroup adsorption of OHA and AEXE,which produced the“loop”structure and intensified the self-assembly alignment of HAOODE on malachite surfaces.In addition,the“h”shape steric orientation of the double hydrophobic groups in HAOODE facilitated stronger hydrophobization toward malachite than the“line”or“V”hydrophobic carbon chains of OHA or AEXE.Thus,HAOODE achieved the preferable flotation recovery of malachite particles in comparison with OHA and AEXE. 展开更多
关键词 S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester atomic force microscopy(AFM) heterodifunctional co-adsorption HYDROPHOBIZATION malachite flotation
下载PDF
Two New Phenolic Carboxylic Acid Esters from Opuntia vulgaris
19
作者 蒋建勤 叶文才 +2 位作者 陈真 楼凤昌 闵知大 《Journal of Chinese Pharmaceutical Sciences》 CAS 2002年第1期1-3,共3页
Two new phenolic carboxylic acid esters n-butyl eucomate(1) and methyl eucomate (2) and six known compounds eucomic acid(3), 3-β-acetyl-taraxerol (4), friedelin(5),lupenone(6),methyl linoleate(7) and methy... Two new phenolic carboxylic acid esters n-butyl eucomate(1) and methyl eucomate (2) and six known compounds eucomic acid(3), 3-β-acetyl-taraxerol (4), friedelin(5),lupenone(6),methyl linoleate(7) and methyl oleate(8) were isolated from the stems of Opuntia vulgaris Mill(Cactaceae). Their structures were determined on the basis of spectral methods. Compounds 3,4,6,7,8 were isolated for the first time from this plant. 展开更多
关键词 Opuntia vulgaris Phenolic carboxylic acid ester n-Butyl eucomate Methyl eucomate
下载PDF
Synthesis and Crystal Structure of Dicopper(II) Compound Containing Oxalate and Reduced Imino Nitroxide Radicals 被引量:1
20
作者 LILi-Cun DONGChao-Ling LIAODai-Zheng JIANGZong-Hui YANShi-Ping 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2004年第3期296-299,共4页
A new dicopper(II) compound with oxalate and reduced imino nitroxide radicals [Cu2(m-C2O4)(Him2-py)2(H2O)2](NO3)2 (Him2-py=1-hydroxy-2-(2-pyridyl)-4,4,5,5-tetramethyli- midazoline) has been synthesized and its crystal... A new dicopper(II) compound with oxalate and reduced imino nitroxide radicals [Cu2(m-C2O4)(Him2-py)2(H2O)2](NO3)2 (Him2-py=1-hydroxy-2-(2-pyridyl)-4,4,5,5-tetramethyli- midazoline) has been synthesized and its crystal structure was determined by X-ray diffraction method. The complex crystallizes in monoclinic, space group P21/n with a = 9.913(4), b = 19.057(8), c = 10.169(4) ? b = 114.292(7), V = 1751(1) 3, C26H38Cu2N8O14, Mr = 813.72, Dc = 1.543 g/cm3, m(MoKa) = 1.290 mm-1, F(000) = 840, Z = 2, the final R = 0.0398 and wR = 0.0986 for 1878 observed reflections (I>2s(I)). The imino nitroxide 2-(2-pyridyl)-4,4,5,5-tetramethyl- imidazoline-1-oxyl (im2-py) is reduced in the reaction to yield Him2-py which consists of oxalato-bridged centrosymmetric [Cu2(m-C2O4)(Him2-py)2(H2O)2]2+ ions and noncoordinated NO3- anions. Each copper(II) ion is in a distorted tetragonal pyramid environment: two nitrogen atoms from Him2-py and two oxygen atoms from the oxalate group are in the basal plane, and one water molecule at the axial position. 展开更多
关键词 crystal structure reduced nitroxide radical dicopper compound oxalate bridge
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部