四中位（邻烷基）苯基卟啉及其高铁络合物的合成及光谱性质

合成了６种不同大小的烷基取代的四中位（邻烷基）苯基卟啉Ｔ＿（Ｏ－Ｒ）ＰＰＨ＿２及其高铁络合物Ｔ＿（Ｏ－Ｒ）ＰＰＦｅＣｌ（Ｒ＝ＣＨ＿３，Ｃ＿２Ｈ＿５，ｎ－Ｃ＿３Ｈ＿７，ｉ－Ｃ＿３Ｈ＿７，ｎ－Ｂｕ，ｔ－Ｂｕ），除Ｒ＝ＣＨ＿３外，其它５种是文献未曾报道过的新化合物。测定了它们的核磁共振谱、红外及电子光谱，并讨论了它们的结构与光谱性质的关系．     

金属离子与卟啉的嵌入反应动力学研究──Ⅶ．一元酸根催化Cu(Ⅱ)与溴化间－四(N－乙酸甲酯基－3－吡啶基)卟啉的配位反应

研究了在３５±０．１℃、离子强度０．５ｍｏｌ／Ｌ（ＫＣｌ）条件下，甲酸根、乙酸根、丙酸根和丁酸根分别催化Ｃｕ（Ⅱ）离子与四溴化间－四（Ｎ－乙酸甲酯基－３－吡啶基）卟啉（Ｈ２Ｔβ－Ｎ－ＡＣＭｓｐｙＰＢｒ４）的反应动力学及其机理，该类反应对卟啉和Ｃｕ（Ⅱ）离子均为一级反应，反应动力学方程为：ｄ［ＣｕＰ＾４＋］／ｄｔ＝ｋ｛１．０＋ｂ［Ａ＾－］）／（１．０＋Ｋ３，４．［Ｈ＾＋］＾２｝［Ｃｕ＾２＋］［Ｐ］Ｔ     

聚己内酯、聚环氧丙烷大单体制备及其与甲基丙烯酸正丁酯共聚合

聚己内酯、聚环氧丙烷大单体制备及其与甲基丙烯酸正丁酯共聚合曹维孝，管治斌，江必旺，冯新德（北京大学化学系北京１００８７１）关键词大单体，聚己内酯，聚环氧丙烷以四苯基卟啉氯化铝（ＴＰＰＡＩ－Ｃｌ）与甲基丙烯酸－β－羟基两酯（ＨＰＭＡ）制备的活性开环催化...     

金属离子与卟啉的嵌入反应动力学研究（Ⅵ）：——乳酸缓冲体…

研究了在３５±０．１℃、离子强度０．５ｍｏｌ／Ｌ（ＫＣｌ）下，乳酸根催化Ｃｕ＾２＋离子嵌入溴化间－四（Ｎ－乙酸甲酯基－３－吡啶基）卟啉和溴化间－四（Ｎ－氰乙基－３－吡啶基）卟啉的反应动力学。根据催化剂浓度、溶液的ｐＨ值与反应速率间的关系。得到Ｃｕ＾２＋离子嵌入该类卟啉的反应动力学方程。。实验结果表明，该类反应遵循负离子催化卟啉变机理，变形的卟啉及其与乳酸根离子的缔合物为可能的活性中间体。     

四—[邻（叔丁氧羰甘氨酸）氨基苯基]卟啉锌配合物的合成 …

合成并表征了四－「邻（叔丁氨酸）氨基苯基」卟啉Ｈ２Ｔ（ｏ－ＢｏｃＧｌｙ）ＡＰＰ（１）及其锌（Ⅱ）配合物ＺｎＴ（ｏ－ＢｏｃＧｌｙ）ＡＰＰ（２）,用紫外－可光谱测定滴定法测定了配合物２与６种咪唑配体轴向配位反应的平衡常数,研究了它作为主体分子对咪唑类小分子的识别,研究结果表明,各配体的缔合常数按Ｋ（Ｉｍ）〉Ｋ（２－ＣＨ３Ｉｍ）〉Ｋ（ＫＭＩｍ）〉Ｋ（Ｎ－ＣＨ３Ｉｍ）〉Ｋ（２－ＨＯＣＨ２Ｉｍ）〉Ｋ（ＧＭＡ     

5,10,15—三（4—氨基）苯基—20—苯基卟啉的电聚合膜及其金属化膜的电分…

本文对新型结构的卟啉进行电化学聚合，制得聚卟啉修饰电极，并在此基础上直接进行金属化，得到金属化的Ｃｕ聚卟啉修饰电极，实验表明，聚卟啉修饰电极在ｐＨ１－６的范围，对ｐＨ的变化呈能斯特响应，斜率为５９．８ｍＶ／ｐＨ，金属化Ｃｕ聚卟啉ｐＨ也具有能斯特响应，范围为ｐＨ４－８，斜率为２８．７ｍＶ／ｐＨ。可用于实际样品的测定。     

金属卟啉－甲基紫精二连体配合物的合成及其光化学行为

本文合成了四（对－氯代甲基）苯基－甲基紫精卟啉及其Ｚｎ，Ｃｏ，Ｍｎ配合物，用元素分析、红外光谱和紫外可见光谱进行了表征。研究了它们的光化学性质。结果表明，在ＴＥＯＡ中光照使Ｍ。ＴＣＭＰＰ－ｍｖ＾２＋发生了分子内从卟啉到甲基紫精的电子迁移反应。在ＺｎＴＣＭＰＰ－ｍｖ＾２＋／ＴＥＯＡ／ＤＭＳＯ－Ｈ２Ｏ体系中可发生光敏化还原ｍｖ＾２＋反应，生成较稳定的ｍｖ＾＋。在Ｍｎ（Ⅲ）ＴＣＭＰＰ－ＭＶ＾２＋／ＣＨ３     

meso—四（4—N—取代吡啶基）卟啉铜（Ⅱ）配事物的合成及其对O^—2的清除作用

以Ｃｕ２（ＯＨ）２ＣＯ３为原料通过对非均相金属插入反应合成ｍｅｓｏ－四（４－Ｎ－甲基吡啶基）卟啉合铜和ｍｅｓｏ－四（４－Ｎ－苄基吡啶基）卟啉合铜。方法操作方便产率高。研究表明，在核黄素光照产生Ｏ＾－２的体系中，ＣｕＴＭＰｙＰ和ＣｕＴＢＰｙＰ对Ｏ＾－２具有明显的清除作用，对人红细胞内血红蛋白具有一定保护作用。     

新合成的“栅栏式”卟啉及其金属配合物的磁圆二色性研究

研究了３种新合成的“栅栏式”卟啉ｍｅｓｏ－四（ａ，ａ，ａ，ａ－（２－呋喃甲酰氨基）苯基）卟啉（１）、ｍｅｓｏ－四（ａ，ａ，ａ，ａ－Ｏ－（２－噻吩甲酰氨基）苯基）卟啉（２）、ｍｅｓｏ－四（ａ，ａ，，ａ，ａ－Ｏ－（苯并－１５－冠－５－４′－甲酰氨基）苯基）卟啉（３）及其金属配合物：１－ＦｅＣｌ，２－Ｃｕ，３－Ｆｅｃｌ，３－Ｚｎ的磁圆二色谱（ＭＣＤ）利用Ｂｕｃｋｉｎｇｈａｍ－Ｓｔｅｐｈｅｎｓ方程讨论了分     

o／o型单核铁（Ⅲ）卟啉二聚体模拟细胞色素P450酶催化环已烷羟化？…

合成和表征了一系列以柔韧烷氧链相连的ｏ／ｏ型单核铁卟啉二聚体,利用Ｘ－光电子能谱（ＸＰＳ）研究了卟啉二聚体中由自由卟啉环向铁卟啉环发生的分子内电子转移,考察３了在以分子氧为氧源还原剂存在的温和条件下,该类配合物模拟细胞色素Ｐ４５０酶对环已烷羟化反应的催化性能。结果表明,该系列ｏ／ｏ莳的卟啉二聚体的催化性能明显优于相应的铁卟啉单体ＦｅＴＰＰＣｌ。随着烷氧链的增长,催化活性次序为：Ｃ２〉Ｃ４〉Ｃ６〉Ｃ     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Microwave-assisted copper-catalyzed stereoselective ring expansion of three-membered heterocycles with α-diazo-β-dicarbonyl compounds

Microwave-assisted copper-catalyzed ring expansions of three-membered heterocycles with α-diazo-β-dicarbonyl compounds were investigated. Thiiranes generated 3-acyl-5,6-dihydro-1,4-oxathiines in the presence of copper sulfate and trans-3-acyl-5,6-dihydro-1,4-oxathiines as stereospecific products for 1,2-disubstituted cis-thiiranes through an intramolecular S_N2 process. Oxiranes gave rise to 2-acyl-5,6-dihydro-1,4-dioxines under the catalysis of copper hexafluoroacetylacetonate and cis-3-acyl-5,6-dihydro-1,4-dioxines as stereospecific products for 1,2-disubstituted cis-oxiranes via an intimate ion-pair mechanism. The current method provides a direct and simple strategy in efficient preparation of 3-acyl-5,6-dihydro-1,4-oxathiines and 2-acyl-5,6-dihydro-1,4-dioxines, important agents in medicinal and agricultural chemistry, from readily available thiiranes and oxiranes, respectively.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.