共查询到20条相似文献,搜索用时 24 毫秒
1.
Jun Min HUANG* Hui CHEN Ru Yu CHEN Institute of Elemento-Organic Chemistry National Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 《中国化学快报》2002,(2)
Organophosphorus compounds are ubiquitous in nature and they have broad applications in the fields of agriculture and medicine1-4. There has been a considerably growing interest in heterocyclic compounds due to their pharmaceutical importance and extensive application in organic synthesis, and the application of heterocycles is suggested to enhance the biological activity and/or offer other diverse properties5-7. In the previous work8, we have reported that 11-ethoxycarbonylmethyl-6-oxo-3, 4… 相似文献
2.
《结构化学》1992,(2)
<正> The structure of title compound [C7H6N2OPS3]-·[HNC5H5]+ was determined by x-ray diffraction. It belongs to monoclinic system with space group P21/a, a = 16.745(2), b= 8.563(2), c=21. 050(5)(?), β=93.32(1)°, V= 3013. 6(?)3, Z = 8, Mr = 341. 4, F (000) = 1536, Dc=1. 504 g. cm-3,μ= 53. 0 cm-1. The crystal is composed of discrete cations C5H5NH+ and anions CrH6N2OPS3-. There are two pairs of the cations and the anions in each asymmetric unit. The stability of the anion is increased by the formation of (d-p)π bonding involving the 3d orbital of the P atom and the lone electron pairs of the S atoms. 相似文献
3.
1INTRoDUCT1oNThechemistriesofsamariumdiiodideandlow-valenttitaniumareofcurrentin--.terestinorganicSynthesis.Theyhavebeenwidelyusedinsyntheticreactions(l.2i.Thereactivityofthereagentstowardsvariousnitrogen-containingcomPOundshasal-readybeenexamined.Thereare,toourknowledge,noliteratureexamplesforthereductionofafylidenecyanoacetatederivativeswiththesereagents.Recently,wefoundthatthetitlecompoundisobtainedbycyclodimerizationreactionofpchlorObenzylidenecyanoacetatewithsamariumdiiodideorlow-va… 相似文献
4.
TaiXIAO HuiXueLI ChunXiaTAN MiaoCHEN 《中国化学快报》2005,16(3):335-337
A series of 3-pyridinyl-6-aryl-1, 2, 4-triazolo[3, 4-b][1, 3, 4]thiadiazoles(PATT) were prepared, the structures were confirmed by 1R and ^1H NMR spectra. The results of cyclic voltammetry measurements imply that all these compounds have a higher electron affinity (EA) than 2-(4-biphenyl)-5-(4-tert-butyl phenyl)-1, 3. 4-oxadiazole (PBD) which implies that PATT could be acting as better electron acceptors than widely used electron transporting material PBD. 相似文献
5.
吴伸 董贻诚 杨石先 陈其杰 王明德The Institute of Elemento-Organic Chemistry Nankai University Tianjin 《中国科学B辑(英文版)》1984,(12)
The two crystal structures of C_(17)H_(17),N_2O_2Cl_2PS (NP-8) and C_(17)H_(19)N_2O_2PS (NP-10-Ⅱ) have beendetermined by Patterson method. The crystals belong to monoclinic system with space group of P2_1/aand P2_1/n respectively. There are four molecules in the unit cell. Cell parameters: a = 26.622 (7)A, b = 7.711 (2) A., c = 9.461 (3) A, β = 94.90°(4) and a = 18.879(3) A, b = 10.199 (13) A, c = 8.948(3) A, β= 94.30°(3) for the two cells. After refinement by block diagonal matrix least squares me-thod, R factors are 0.046 for 2971 reflections of NP-8 and 0.076 for 1711 reflections of NP-10-Ⅱ. Referring to molecular structures of NP-8 and NP-10-Ⅱ spectra data have been satisfactorilycxplained. The characteristic features of the structures have been discussed. 相似文献
6.
The first example of fused phosphorus heterocyclic 4-[ l′-(β-bromoethyl)-4'-oxo-3'-prop yl-1′, 2′, 3′, 4-tetrahydro-1, 3, 2-benzodiazaphosphorin-2′-sulfide]-1, 2, 3, 4, 4a, 4b, 5, 6-octahydro -6-oxo-5-propyl-3, 4b, 4a-thiazphosphaphenanthridine 4a, 2′-dioxide was synthesized in excellent yield by refluxing a mixture of 1-(2-bromoethyt)-2, 3-dihydro-3-propyl-l, 3, 2-benzodiazaphos phorin-4(1H)-one 2-oxide with carbon disulfide in benzene in the presence of triethylamine. 相似文献
7.
Ohne Zusammenfassung 相似文献
8.
Synthesis of 3-Phenyl-6-formyl-3, 4-dihydro-2H-1, 3-benzoxazine 总被引:2,自引:0,他引:2
Qi Chao RAN Qiao TIAN Yi GU 《中国化学快报》2006,17(10):1305-1308
Benzoxazine is a novel class of thermosetting resins, which possesses lots of outstanding properties such as no by-products and near-zero shrinkage during polymerization as well as good molecular design flexibility1-2. Furthermore, polybenzoxazines (PBZs)… 相似文献
9.
10.
用聚乙二醇作为可溶性聚合物载体和相转移催化剂高效简单的合成了1, 2, 3, 4-四氢吡啶并[3, 2-d]嘧啶类化合物。该合成路线为聚乙二醇与2, 3-吡啶二酸酐反应生成聚乙二醇支载的单酯1,接着1被转化成相应的聚乙二醇支载的酰基叠氮2,2经Curtius重排,与胺加成并同时关环给出目标产物,其总产率为84%-88%。 相似文献
11.
YongHAN ZhiBinZHANG JunPingXIAO WenPengYAN MeiGongFAN 《中国化学快报》2005,16(2):175-178
Novel diarylethene derivatives: N-substituted-3,4-bisheteroaryl-2,5-dihydropyrroles were synthesized through Mcmurry couple reaction with high yields. The photochromic properties and UV-Vis absorption spectra were studied. The maximal absorptions of their close forms were around at 406 nm or 446 nm, which related mainly with heteroaryl groups but not with substituted groups at nitrogen atom of dihydropyrrole. The absorption of their colored form could be matched with blue light laser. 相似文献
12.
我们在合成鞘氨醇3时,成功地分离到一对环亚硫酸酯1由于硫原子手性形成的非对映异构体,通过氢核磁共振谱分析和分子力学计算,确定了它们手性硫原子的绝对构型. 相似文献
13.
我们在合成鞘氨醇3时,成功地分离到一对环亚硫酸酯1由于硫原子手性形成的非对映异构体,通过氢核磁共振谱分析和分子力学计算,确定了它们手性硫原子的绝对构型。 相似文献
14.
《结构化学》1992,(4)
<正> C16H13N5S2· (C2H5)3N: Mr = 440. 64, monoclinic, space group C2/c with a = 18.956(7)(?), b = 12. 866(7)(?), c = 20. 830(9)(?) , β=115. 63(3)°; Z=8; V = 4580(7)(?)3; Dc = 1. 278gcm-3; F (000) = 1872, μ= 2. 423cm-1 (MoKa). Final R is 0. 069. C16H13N5S2is non-planar with two rings, a five-member and a six-member with conformations of envelope and twist boat forms respectively, and the two substituted phenyl groups are in equatorial and axial positions. 相似文献
15.
《Tetrahedron letters》1988,29(36):4535-4538
The title compounds are described for the first time and are the result of (3+2)- and (4+2)-cycloaddition reactions with phosphaalkenes. 相似文献
16.
De Jiang LI He Qing FU 《中国化学快报》2006,17(5):625-627
1, 3, 4-Oxadiazoline derivatives are found to possess significant biological activities such as antifungal1, insecticidal2, CNS depressant3-5, anticonvulsant effects and plant growth accelerator. They are highly important heterocycles, and have been used … 相似文献
17.
Synthesis and Fungicidal Activities of 2-Alkylthio-5- (3, 4, 5-tribenzyloxyphenyl)-1, 3, 4-oxadiazoles 总被引:1,自引:0,他引:1
De Qing LONG De Jiang LI Wei Quan CAI Sheng Sheng CHEN 《中国化学快报》2006,17(11):1427-1430
Abstract: Ten novel 2-alkylthio-5-(3, 4, 5-tribenzyloxyphenyl)-1, 3, 4-oxadiazole derivatives (5a-j) were synthesized from methyl 3, 4, 5-trihydroxybenzoate by ethedfication, hydrazidation, cyclization and thioetherification reactions. The structures of 5a-j were confirmed by 1HNMR, MS spectra and elemental analysis. The results indicated that most of the compounds 5 exhibited good fungicidal activities. The activity of 5h is higher than 90% against Fusarium oxysporum and Botrytis cinereapers in 50 mg/L. 相似文献
18.
GuoQiangHU SongQiangXIE WenLongHUANG HuiBinZHANG 《中国化学快报》2005,16(6):723-726
To find new structural leading compounds for the research of the multidrug resistant of antibacterial agents, five novel 8-substituted phenyl-l-pyridin-3-yl-5H-bis[1, 2, 4] triazolo[3, 4-b;4‘,3‘-d] thiadiazines were prepared from the corresponding intermediates of 3-(5-substituted phenyl[1,3,4]oxadiazol-2-ylmethylsulfanyl)-5-pyridin-3-yl-[1,2,4]triazol-4-ylamines via intramolecular cyclization and the antibacterial activity in vitro against Gram-postive (G^ ) and Gramnegatiye (G) bacteria was primarily evaluated. 相似文献
19.
1mTRODUCT10NSincethetimeKaganhasdem0nstratedasimplepreparationofsamariumdiio-didefromsamariummetaland1,2-diiodoethanet1),SmI2hasbeenwidelyusedinsyntheticreactionst23.Thereactivityofsamariumdiiodidetowardsvariousnitrogen-containingcomP0undshasalreadybeenexamined.Thereare,toourknowledge,noliteratureexamplesforthereductionofcyanogrouptoproduceaminowiththisreagent.Inthispaper,wediscussedthecrystalstructureofthetitlecomP0undsyn-thesizedbythereactionofsamariumdii0didereagentwithp-chloroben-zyli… 相似文献
20.
SO4^2—/TiO2,PO4^3—/TiO2,BO3^3—/TiO2系列固体酸的酸性,结构和晶 … 总被引:8,自引:0,他引:8
制备了SO4^2-/TiO2(I)、PO4^3-/TiO2(Ⅱ)、BO3^3-/TiO2(Ⅲ)系列固体酸。用IR、Raman光谱对该系列固体酸进行结构表征,结果表明SO4^2-与TiO2表面的结合为螯合式双配位结构和共价硫酸盐共存,PO4^3-与TiO2表面的结合为桥式三配位结构,BO3^3-与TiO2表面的结合为单齿单配位结构和螯桥混合式三配位结构共享。用由溶液中正胺的吸附等温线测定固体表面酸度 相似文献